a(n) = Sum_{k=0..n} 2^(n-k) * binomial(n+2,k+2) * binomial(2*k+4,k+4).
A387272
a(n) = Sum_{k=0..n} 2^(n-k) * binomial(n+2,k+2) * binomial(2*k+4,k+4).
Terms
- a(0) =1a(1) =12a(2) =100a(3) =720a(4) =4815a(5) =30884a(6) =193144a(7) =1188576a(8) =7236690a(9) =43741720a(10) =263056728a(11) =1576298464a(12) =9421080123a(13) =56200937940a(14) =334801389360
External references
- oeis: A387272