a(n) = 4*a(n-1) - a(n-2), a(0)=1, a(1)=1.
1, 1, 3, 11, 41, 153, 571, 2131, 7953, 29681, 110771, 413403, 1542841, 5757961
4 seqfan posts
Sun Sep 13 18:42:04 CEST 2009 [seqfan] Re: Duplicates
Sun Sep 13 18:26:28 CEST 2009 [seqfan] Re: Duplicates
Sun Sep 13 17:28:08 CEST 2009 [seqfan] Duplicates
Sun Jan 11 23:36:02 CET 2009 [seqfan] Index of linear recurrences
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
.