Triangle read by rows: T(n,0)=1, T(n,n)=(2*n-1)!!+1, T(n,k) = 2*(n-k) * T(n-1,k-1) + 2*(k+1)*T(n-1,k).
A099755
Triangle read by rows: T(n,0)=1, T(n,n)=(2*n-1)!!+1, T(n,k) = 2*(n-k) * T(n-1,k-1) + 2*(k+1)*T(n-1,k).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =10a(5) =4a(6) =1a(7) =44a(8) =44a(9) =16a(10) =1a(11) =182a(12) =440a(13) =216a(14) =106a(15) =1a(16) =736a(17) =3732a(18) =3488a(19) =1492a(20) =946a(21) =1a(22) =2954a(23) =28280a(24) =50296a(25) =28872a(26) =14336a(27) =10396a(28) =1a(29) =11828
External references
- oeis: A099755