A168591 a(n) = sum of the n-th power of the trinomial coefficients in row n of triangle A027907.

1, 3, 19, 831, 281907, 764206503, 16955359883149, 3120135986465328015, 4819828380706011142058787, 63004580363300194268932114354503, 7017256966823394610075464951176481843849

Offset: 0

Author

Paul D. Hanna, Dec 01 2009

Keywords

• nonn

Crossrefs

Cf. A168590, A027907.

Programs

PARI

a(n)=sum(k=0,2*n,polcoeff((1+x+x^2)^n,k)^n)

Formula

Ignoring initial term, equals the logarithmic derivative of A168590.