a(n) = K(4,n), where K(M,n) = 2*(2*M+3)!*(4*n+2*M+1)!/((M+2)!*M!*n!*(3*n+2*M+3)!).
A362103
a(n) = K(4,n), where K(M,n) = 2*(2*M+3)!*(4*n+2*M+1)!/((M+2)!*M!*n!*(3*n+2*M+3)!).
Terms
- a(0) =42a(1) =330a(2) =2310a(3) =16170a(4) =115500a(5) =844074a(6) =6301680a(7) =47948670a(8) =370952010a(9) =2911858950a(10) =23150207388a(11) =186127769100
External references
- oeis: A362103