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1, 2, 3, 4, 6, 7, 8, 11, 14, 15, 16, 20, 26, 30, 31, 32, 37, 47, 57, 62, 63, 64, 70, 85, 105, 120, 126, 127, 128, 135, 156, 191, 226, 247, 254, 255, 256, 264, 292, 348, 418, 474, 502, 510, 511, 512, 521, 557, 641, 767, 893, 977, 1013, 1022, 1023, 1024, 1034, 1079, 1199
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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FORMULA
| a(n)=sum_{j=1..n-1} A007318(j).
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EXAMPLE
| a(1)=0!/(0!(0-0)!)=1.
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MATHEMATICA
| Flatten[Table[2^a-1+Sum[Binomial[a, p], {p, 0, b}], {a, 0, 10}, {b, 0, a}]] (* Frank M Jackson, Apr 25 2011 *)
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CROSSREFS
| Cf. A007318, A008949.
Sequence in context: A061985 A102826 A191381 * A027206 A198034 A016027
Adjacent sequences: A163863 A163864 A163865 * A163867 A163868 A163869
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KEYWORD
| nonn
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AUTHOR
| Juri-Stepan Gerasimov (2stepan(AT)rambler.ru), Aug 06 2009
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EXTENSIONS
| Entries checked by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 11 2009.
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