(2/3)*(4^n-1).
0, 2, 10, 42, 170, 682, 2730, 10922, 43690, 174762, 699050, 2796202, 11184810
6 seqfan posts
Mon Oct 11 00:45:00 CEST 2010 [seqfan] Re: Sequence of the Day today: A020988
Sun Oct 10 23:51:42 CEST 2010 [seqfan] Re: Sequence of the Day today: A020988
Sun Oct 10 17:12:26 CEST 2010 [seqfan] Re: Sequence of the Day today: A020988
Sun Oct 10 04:30:43 CEST 2010 [seqfan] Re: Sequence of the Day today: A020988
Sun Oct 10 04:17:55 CEST 2010 [seqfan] Re: Sequence of the Day today: A020988
Sun Oct 10 03:38:34 CEST 2010 [seqfan] Sequence of the Day today: A020988
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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