[seqfan] A000292 (fwd)

[rkg]

Further apologies if you've received multiple copies of this.  R.

---------- Forwarded message ----------
Date: Thu, 26 Feb 2015 13:12:39 -0700 (MST)
From: rkg <rkg at ucalgary.ca>
To: Sequence Fans <seqfan at ext.jussieu.fr>
Subject: A000292 (fwd)

Sorry, my email has been ``upgraded'' and now my address file seems
to be all aglee.  R.

---------- Forwarded message ----------
Date: Thu, 26 Feb 2015 13:03:43 -0700 (MST)
From: rkg <rkg at ucalgary.ca>
To: Neil Sloane <njasloane at gmail.com>,
      Sloane's Dream Team <Antti.Karttunen at gmail.com>, bowerc at usa.net,
      david at research.att.com, David Wilson <davidwwilson at comcast.net>,
      deutsch at duke.poly.edu, djr at nk.ca, dwasserm at earthlink.net,
      editors at seqfan.net, j.mccranie at comcast.net, layman at math.vt.edu,
      mathar at strw.leidenuniv.nl, maxal at cs.ucsd.edu, maxale at gmail.com,
      maximilian.hasler at gmail.com, mlb at well.com, njas at research.att.com,
      noe at sspectra.com, rayjchandler at sbcglobal.net, rgwv at rgwv.com,
      rsc at swtch.com,
      simon.plouffe at gmail.com, simon.plouffe at sympatico.ca,
      somos at grail.cba.csuohio.edu, stefan.steinerberger at gmail.com,
      wasserma at spawar.navy.mil
Subject: A000292

Dear all,
          As my Mother used to say, I'm not a good looker, so
I may have missed someething in A000292.  These are not only
the triangular pyramidal numbers, but also the kind of square
pyramidal numbers you get by using cubes, and insisting that
square faces must always coincide:

1^2, 2^2, 1^2+3^2, 2^2+4^2, 1^2+3^2+5^2, 2^2+4^2+6^2, ...

           R.
1   1  1   1  1  1   1  1  1  1   1  1  1  1  1
      1  1   1  2  1   1  2  2  1   1  2  2  2  1
             1  1  1   1  2  2  1   1  2  3  2  1
                       1  1  1  1   1  2  2  2  1
                                    1  1  1  1  1