a(n) = (1/4) * Sum_{k=0..n} (k+2) * 2^k * binomial(2*k+2,2*n-2*k+1).
A391832
a(n) = (1/4) * Sum_{k=0..n} (k+2) * 2^k * binomial(2*k+2,2*n-2*k+1).
Terms
- a(0) =1a(1) =6a(2) =30a(3) =160a(4) =824a(5) =4112a(6) =20240a(7) =98432a(8) =473648a(9) =2260000a(10) =10707872a(11) =50428928a(12) =236267264a(13) =1101967872a(14) =5119345152a(15) =23699419136a(16) =109371557120a(17) =503331831296
External references
- oeis: A391832