a(n) = Sum_{k=0..n} 5^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).

A360321

a(n) = Sum_{k=0..n} 5^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).

Terms

    a(0) =1a(1) =2a(2) =16a(3) =130a(4) =1070a(5) =8902a(6) =74724a(7) =631902a(8) =5376840a(9) =45990070a(10) =395106656a(11) =3407196982a(12) =29477061166a(13) =255733684010

External references