a(n) = (3^3)*(1*2*4*5*7*8*10*11)*(3*n)!/(n!*(n+4)!^2).
A361031
a(n) = (3^3)*(1*2*4*5*7*8*10*11)*(3*n)!/(n!*(n+4)!^2).
Terms
- a(0) =11550a(1) =2772a(2) =4620a(3) =15840a(4) =81675a(5) =550550a(6) =4492488a(7) =42325920a(8) =446185740a(9) =5148297000a(10) =63985977000a(11) =846321189120
External references
- oeis: A361031