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1, 1, 2, 4, 6, 9, 13, 18, 24, 31, 40, 50, 63, 77, 95, 114, 138, 163, 194, 226, 266, 307, 357, 408, 471, 535, 612, 690, 785, 881, 995, 1110, 1248, 1387, 1550, 1714, 1908, 2103, 2329, 2556, 2822, 3089, 3396, 3704, 4061, 4419, 4827, 5236, 5707, 6179, 6714, 7250, 7862
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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COMMENTS
| Contribution from Gary W. Adamson (qntmpkt(AT)yahoo.com), Jul 27 2010: (Start)
(1 + x^2 + x^3 + x^4 + x^5 + ...) * (1 + x + x^2 + 2x^3 + 3x^4 ...) =
(1 + x + 2x^2 + 4x^3 + 6x^4 + ...). (End)
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FORMULA
| a(n) = a(n-1)+a(floor(n/2))+(1-(-1)^n)/2, n>1. - Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 02 2003
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CROSSREFS
| Cf. A088567, A088585.
Equals A088585-1.
Sequence in context: A177239 A000064 A001305 * A177189 A026906 A171861
Adjacent sequences: A088572 A088573 A088574 * A088576 A088577 A088578
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 30 2003
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