G.f.: x^4*(1+x)*(1+12*x-31*x^2+12*x^2)/((1-x)^2*(1-2*x)^2*(1-3*x)*(1-4*x)).
A187695
G.f.: x^4*(1+x)*(1+12*x-31*x^2+12*x^2)/((1-x)^2*(1-2*x)^2*(1-3*x)*(1-4*x)).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =26a(6) =264a(7) =1846a(8) =10616a(9) =54354a(10) =258388a(11) =1168862a(12) =5109696a(13) =21805162a(14) =91460972a(15) =378874998a(16) =1555269016a(17) =6341845250a(18) =25732834116a(19) =104034429454a(20) =419461348976
External references
- oeis: A187695