G.f.: 1/((1-6*x)*(1-9*x)*(1-12*x)).
A020724
G.f.: 1/((1-6*x)*(1-9*x)*(1-12*x)).
Terms
- a(0) =1a(1) =27a(2) =495a(3) =7695a(4) =109431a(5) =1474767a(6) =19198215a(7) =244167615a(8) =3055792311a(9) =37811613807a(10) =464078786535
External references
- oeis: A020724