Triangle T(n,k), 1<=k<=n, read by rows defined by :T(n,k)=C(n,k)*C(n-1,k-1)+C(n,k-1)*C(n-1,k)where C(n,k)=A007318(n,k) .
A128821
Triangle T(n,k), 1<=k<=n, read by rows defined by :T(n,k)=C(n,k)*C(n-1,k-1)+C(n,k-1)*C(n-1,k)where C(n,k)=A007318(n,k) .
Terms
- a(0) =1a(1) =3a(2) =1a(3) =5a(4) =9a(5) =1a(6) =7a(7) =30a(8) =18a(9) =1a(10) =9a(11) =70a(12) =100a(13) =30a(14) =1a(15) =11a(16) =135a(17) =350a(18) =250a(19) =45a(20) =1a(21) =13a(22) =231a(23) =945a(24) =1225a(25) =525a(26) =63a(27) =1a(28) =15a(29) =364
External references
- oeis: A128821