Motzkin sums: a(n) = (n-1)*(2*a(n-1)+3*a(n-2))/(n+1). Also called Riordan numbers or ring numbers.
1, 0, 1, 1, 3, 6, 15, 36, 91, 232, 603, 1585, 4213, 11298, 30537, 83097, 227475
8 seqfan posts
Wed Apr 18 01:42:53 CEST 2012 [seqfan] Re: A005043 - bijection sought
Tue Apr 17 11:27:59 CEST 2012 [seqfan] Re: A005043 - bijection sought
Tue Apr 17 07:21:11 CEST 2012 [seqfan] A005043 - bijection sought
Fri Aug 20 18:23:01 CEST 2010 [seqfan] Re: Extending the superseeker
Fri Aug 20 14:23:50 CEST 2010 [seqfan] Re: Extending the superseeker
Sat Aug 14 01:05:54 CEST 2010 [seqfan] Extending the superseeker
Mon Jan 25 23:27:29 CET 2010 [seqfan] Re: any one else submitted a SUBMITA (addition) and got noconfirmation?
Mon Jan 25 23:09:15 CET 2010 [seqfan] Re: any one else submitted a SUBMITA (addition) and got noconfirmation?
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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