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A058692
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a(n) = B(n) - 1, where B(n) = Bell numbers, A000110.
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14
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1, 4, 14, 51, 202, 876, 4139, 21146, 115974, 678569, 4213596, 27644436, 190899321, 1382958544, 10480142146, 82864869803, 682076806158, 5832742205056, 51724158235371, 474869816156750, 4506715738447322, 44152005855084345
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listen;
history;
text;
internal format)
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OFFSET
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2,2
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LINKS
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FORMULA
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G.f.: Sum_{k > 1} x^k / ((1 - x) * (1 - x^2) * ... * (1 - x^k)). - Michael Somos, Feb 26 2014
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EXAMPLE
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G.f. = x^2 + 4*x^3 + 14*x^4 + 51*x^5 + 202*x^6 + 876*x^7 + 4139*x^8 + ...
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MATHEMATICA
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PROG
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CROSSREFS
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Column k=2 of both A058710 and A058711 (which are the same except for column k=0).
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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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