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Search: id:A064188
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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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+0
2
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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; listen)
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OFFSET
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0,2
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MATHEMATICA
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Table[ Sum[ Binomial[ n - i*(i - 1)/2, i ], {i, 0, Floor[ n/2 ] } ], {n, 1, 30} ]
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CROSSREFS
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Cf. A063978.
Sequence in context: A138926 A077434 A076136 this_sequence A088953 A025034 A052952
Adjacent sequences: A064185 A064186 A064187 this_sequence A064189 A064190 A064191
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KEYWORD
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sign
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AUTHOR
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Helmut Schnitzspan (HSchnitzspan(AT)gmx.de), Sep 05 2001
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Sep 06 2001
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