a(n) = Sum_{k=0..n} 2^k * binomial(n+2,k+2) * binomial(2*k+4,k+4).
A387307
a(n) = Sum_{k=0..n} 2^k * binomial(n+2,k+2) * binomial(2*k+4,k+4).
Terms
- a(0) =1a(1) =15a(2) =166a(3) =1650a(4) =15615a(5) =144025a(6) =1309084a(7) =11793780a(8) =105663885a(9) =943298675a(10) =8401596258a(11) =74716379270a(12) =663813240363
External references
- oeis: A387307