Expansion of 1/(1 - 3*x)^4; 4-fold convolution of A000244 (powers of 3).
A036216
Expansion of 1/(1 - 3*x)^4; 4-fold convolution of A000244 (powers of 3).
Terms
- a(0) =1a(1) =12a(2) =90a(3) =540a(4) =2835a(5) =13608a(6) =61236a(7) =262440a(8) =1082565a(9) =4330260a(10) =16888014a(11) =64481508a(12) =241805655a(13) =892820880a(14) =3252418920a(15) =11708708112a(16) =41712272649a(17) =147219785820a(18) =515269250370
External references
- oeis: A036216