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A064188
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Sum_{ i = 0 .. floor(n/2)} binomial (n - i*(i-1)/2, i).
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1
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1, 3, 4, 8, 12, 18, 27, 40, 58, 83, 118, 195, 242, -1387, -338, 75876, 44491, -3099115, -2028539, 129829195, 91749709, -5687984421, -4236497556, 263653557716, 204087552038, -12979768392096, -10348229609729, 679042377362009, 554161706136054, -37712174126966326
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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MATHEMATICA
| Table[ Sum[ Binomial[ n - i*(i - 1)/2, i ], {i, 0, Floor[ n/2 ] } ], {n, 1, 30} ]
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CROSSREFS
| Cf. A063978.
Sequence in context: A077434 A076136 A146566 * A147620 A195746 A088953
Adjacent sequences: A064185 A064186 A064187 * A064189 A064190 A064191
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KEYWORD
| sign
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AUTHOR
| Helmut Schnitzspan (HSchnitzspan(AT)gmx.de), Sep 05 2001
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 06 2001
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