A022586 Expansion of Product (1+q^m)^21; m=1..inf.

1, 21, 231, 1792, 11067, 58002, 268093, 1120899, 4315269, 15497986, 52441347, 168487473, 517184185, 1524390777, 4332440454, 11914441196, 31798680774, 82574231187, 209091601271, 517272712845, 1252351944165