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A191636
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a(n) = floor((-1 + 4^n)/(-1 + 2*n)).
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3
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3, 5, 12, 36, 113, 372, 1260, 4369, 15420, 55188, 199728, 729444, 2684354, 9942053, 37025580, 138547332, 520602096, 1963413621, 7429132620, 28192605840, 107269427100, 409120605684, 1563749870614, 5988829291716, 22977549119237, 88305875046480, 339894311499660
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OFFSET
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1,1
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LINKS
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MATHEMATICA
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f[n_] := Floor[(-1+4^n)/(-1+2 n)]
Table[f[n], {n, 1, 40}] (* A191636 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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