A292475 Number of solutions to 1 +- 5 +- 12 +- ... +- n*(3*n-1)/2 = 0.

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

Author

Seiichi Manyama, Sep 17 2017

Keywords

• nonn

Crossrefs

Cf. A000326, A058498, A083527, A292474.

Formula

a(n) = A292474(n)/2.