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Search: id:A007576
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| A007576 |
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Number of solutions to k_1+2*k_2+..+n*k_n=0, where k_i are from {-1,0,1}, i=1..n.
(Formerly M2656)
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+0
5
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| 1, 1, 1, 3, 7, 15, 35, 87, 217, 547, 1417, 3735, 9911, 26513, 71581, 194681, 532481, 1464029, 4045117, 11225159, 31268577, 87404465, 245101771, 689323849, 1943817227, 5494808425, 15568077235, 44200775239, 125739619467
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