a(n) = 1/((d-1)*n + 1)*Sum_{i=0..n} binomial((d - 1)*n+1, n-i) * binomial((d-1)*n+i, i), with d = 6.
A363006
a(n) = 1/((d-1)*n + 1)*Sum_{i=0..n} binomial((d - 1)*n+1, n-i) * binomial((d-1)*n+i, i), with d = 6.
Terms
- a(0) =1a(1) =2a(2) =22a(3) =342a(4) =6202a(5) =122762a(6) =2571326a(7) =56031470a(8) =1257199154a(9) =28849835538a(10) =673953255142
External references
- oeis: A363006