a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027023.
A027046
a(n) = Sum_{k=0..n} T(n,k) * T(n,n+k), with T given by A027023.
Terms
- a(0) =1a(1) =2a(2) =5a(3) =16a(4) =65a(5) =286a(6) =1305a(7) =6232a(8) =30377a(9) =150178a(10) =750937a(11) =3785904a(12) =19215865a(13) =98086646a(14) =503087741a(15) =2591128000a(16) =13394476993a(17) =69466312210a(18) =361315132065
External references
- oeis: A027046