2*3^(n-1), n >= 1.
1, 2, 6, 18, 54, 162, 486, 1458, 4374, 13122, 39366, 118098, 354294, 1062882
3 seqfan posts
Sun Sep 13 18:42:04 CEST 2009 [seqfan] Re: Duplicates
Wed Nov 19 17:41:23 CET 2008 [seqfan] Re: A025192=A008776
Wed Nov 19 10:21:22 CET 2008 [seqfan] A025192=A008776
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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