A380048 a(n) = A000045(n) * A001003(n).

0, 1, 3, 22, 135, 985, 7224, 55627, 436653, 3503666, 28537245, 235558347, 1965437136, 16552173909, 140505456663, 1200968926590, 10327551834411, 89286693775373, 775611959272392, 6766372185052247, 59256729852910425, 520754062920338026, 4590973472772299193, 40591542233796808247

Offset: 0

Author

Vladimir Kruchinin, Jan 11 2025

Keywords

• nonn
• easy

Crossrefs

Cf. A000045, A001003.

Formula

G.f.: 1/(4*x)-sqrt(16*x^2*(3+6*x+2*x^2)+32*x^2*sqrt(1-6*x-33*x^2+6*x^3+x^4))/(16*sqrt(5)*x^2).

a(n) = A000045(n) * A001003(n).