(Lucas(4n+3)+1)/5, or Fibonacci(2n+1)*Fibonacci(2n+2), or A081015/5.
1, 6, 40, 273, 1870, 12816, 87841, 602070, 4126648, 28284465, 193864606
3 seqfan posts
Mon Oct 27 00:19:31 CET 2008 [seqfan] Proof or counter sample needed
Sun Oct 26 21:29:55 CET 2008 [seqfan] Proof or counter sample needed
Sun Oct 26 20:47:54 CET 2008 [seqfan] Proof or counter sample needed
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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