A321354 Expansion of Product_{k>=0} (1 + x^(3^k))^(3^(k+1)).

1, 3, 3, 10, 27, 27, 45, 108, 108, 147, 333, 333, 480, 1107, 1107, 1467, 3294, 3294, 3801, 8109, 8109, 9300, 19791, 19791, 22644, 48141, 48141, 50806, 104277, 104277, 107011, 216756, 216756, 224937, 458055, 458055, 454437, 905256, 905256, 870777, 1707075, 1707075

Offset: 0

Author

Seiichi Manyama, Nov 07 2018

Keywords

• nonn

Comments

Also the coefficient of x^(3*n) in the expansion of Product_{k>=0} (1 + x^(3^k))^(3^k).

Examples

			Product_{k>=0} (1 + x^(3^k))^(3^k) = 1 + x + 3*x^3 + 3*x^4 + 3*x^6 + 3*x^7 + 10*x^9 + 10*x^10 + 27*x^12 + 27*x^13 + 27*x^15 + 27*x^16 + 45*x^18 + 45*x^19 + ... .
		

Crossrefs

Cf. A073708, A321344, A321355, A321357.