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A292475
Number of solutions to 1 +- 5 +- 12 +- ... +- n*(3*n-1)/2 = 0.
1
0, 0, 0, 0, 0, 1, 1, 2, 0, 1, 2, 2, 0, 15, 23, 39, 0, 105, 183, 322, 0, 1016, 1848, 3347, 0, 10968, 19943, 36549, 0, 123086, 227037, 420857, 0, 1449771, 2700611, 5036699, 0, 17641455, 33106802, 62213791, 0, 220663135, 416387896, 786930971, 0, 2821102744
OFFSET
1,8
FORMULA
a(n) = A292474(n)/2.
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Sep 17 2017
STATUS
approved