a(n) = 3*a(n-1)+3*a(n-2), a(0)=0, a(1)=1.
0, 1, 3, 12, 45, 171, 648, 2457, 9315, 35316, 133893, 507627, 1924560, 7296561
2 seqfan posts
Fri Mar 11 13:57:44 CET 2011 [seqfan] Re: Period lengths of k^2 mod n not in OEIS ?
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
.