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A057682 Sum((-1)^j*binomial(n,3*j+1),j=0..floor(n/3)). +0
4
0, 1, 2, 3, 3, 0, -9, -27, -54, -81, -81, 0, 243, 729, 1458, 2187, 2187, 0, -6561, -19683, -39366, -59049, -59049, 0, 177147, 531441, 1062882, 1594323, 1594323, 0, -4782969, -14348907, -28697814, -43046721, -43046721, 0, 129140163, 387420489, 774840978 (list; graph; listen)
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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.


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