a(n) = Sum_{k=0..n} 2^k * binomial(k+2,2) * binomial(2*k,2*(n-k)).

A391875

a(n) = Sum_{k=0..n} 2^k * binomial(k+2,2) * binomial(2*k,2*(n-k)).

Terms

    a(0) =1a(1) =6a(2) =30a(3) =224a(4) =1464a(5) =8592a(6) =48912a(7) =270720a(8) =1459248a(9) =7709216a(10) =40068000a(11) =205378560a(12) =1040357120a(13) =5216715264a(14) =25927942656a(15) =127867834368a(16) =626272781568

External references