a(n) = coefficient of x^n in Product_{k=0..n} (1 + 2x + 3x^2 +...+ (k+1)*x^k).
A129261
a(n) = coefficient of x^n in Product_{k=0..n} (1 + 2x + 3x^2 +...+ (k+1)*x^k).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =36a(4) =204a(5) =1222a(6) =7513a(7) =46950a(8) =296691a(9) =1890232a(10) =12118424a(11) =78080402a(12) =505134625a(13) =3279051382a(14) =21347213562a(15) =139319046744a(16) =911204289149
External references
- oeis: A129261