a(0) = 1, a(1) = 3; for n>1, a(n) = 2*a(n-1) + 4*a(n-2).
1, 3, 10, 32, 104, 336, 1088, 3520, 11392, 36864, 119296, 386048, 1249280
3 seqfan posts
Thu Aug 19 17:02:49 CEST 2010 [seqfan] Re: Definition of sigma(n) which are powers, A180162
Wed Aug 18 21:26:06 CEST 2010 [seqfan] Re: Definition of sigma(n) which are powers, A180162
Wed Aug 18 20:41:07 CEST 2010 [seqfan] Definition of sigma(n) which are powers, A180162
Index of A-numbers in seqfan: by ascending order
by month
by frequency
by keyword
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