Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1.
0, 1, 1, 3, 5, 11, 21, 43, 85, 171, 341, 683, 1365, 2731, 5461, 10923, 21845, 43691
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
16 seqfan posts
Wed Nov 23 08:36:19 CET 2011 [seqfan] Re: a last-minute entry for the A200000 race
Wed Nov 23 05:24:25 CET 2011 [seqfan] Re: a last-minute entry for the A200000 race
Tue Nov 22 06:31:32 CET 2011 [seqfan] Re: a last-minute entry for the A200000 race
Sun May 1 17:49:44 CEST 2011 [seqfan] re A064098 (Markov equation)
Fri Mar 11 13:57:44 CET 2011 [seqfan] Re: Period lengths of k^2 mod n not in OEIS ?
Wed Dec 29 23:59:26 CET 2010 [seqfan] Tiling and Diagonal Sums
Sat Dec 5 10:09:05 CET 2009 [seqfan] Re: A001045 General form: k=2^n-k
Sat Dec 5 04:05:23 CET 2009 [seqfan] A001045 General form: k=2^n-k
Sat Dec 5 01:59:56 CET 2009 [seqfan] Re: A comment in A001045
Sat Dec 5 01:14:21 CET 2009 [seqfan] A comment in A001045
Tue Aug 4 19:00:41 CEST 2009 [seqfan] Re: Email addresses
Thu Feb 5 17:23:06 CET 2009 [seqfan] More conjectures on sequence products
Mon Nov 3 01:01:12 CET 2008 [seqfan] Re: New interpretation of A001045 - Jacobsthal numbers?
Sun Nov 2 18:25:37 CET 2008 [seqfan] Re: New interpretation of A001045 - Jacobsthal numbers?
Sun Nov 2 18:25:29 CET 2008 [seqfan] Re: New interpretation of A001045 - Jacobsthal numbers?
Sun Nov 2 17:41:48 CET 2008 [seqfan] New interpretation of A001045 - Jacobsthal numbers?
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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