A185757 Column 2 of triangle A185755.

6, 120, 2340, 49315, 1142932, 29141994, 814059798, 24779916843, 817506518829, 29081010732059, 1110248649302494, 45298134089851175, 1967550159430960784, 90668183653348456484, 4418855084158930131012, 227122154996245283660487

Offset: 1

Author

Paul D. Hanna, Feb 03 2011

Keywords

• nonn

Comments

A185755(n,k) equals the coefficient of x^n*y^k in the n-th iteration of x*(1+xy)/(1-x).

Crossrefs

Cf. A185755, A185756, A185758, A185759.