An alternating sum of decreasing powers.
1, 3, 11, 45, 191, 813, 3431, 14325, 59231, 242973, 990551, 4019205, 16249871
2 seqfan posts
Sat Jan 15 16:12:09 CET 2011 [seqfan] Re: Using webcam to search for "more" sequences
Fri Jan 14 22:57:36 CET 2011 [seqfan] Re: Using webcam to search for "more" sequences
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
Links to OEIS content are included according to
The OEIS End-User License Agreement
.