A(n,k) = Sum_{j=0..floor(n/k)} binomial(2*n,k*j+n), square array A(n,k) read by antidiagonals, for n >= 0, k >= 1.
A307665
A(n,k) = Sum_{j=0..floor(n/k)} binomial(2*n,k*j+n), square array A(n,k) read by antidiagonals, for n >= 0, k >= 1.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =1a(4) =2a(5) =11a(6) =1a(7) =2a(8) =7a(9) =42a(10) =1a(11) =2a(12) =6a(13) =26a(14) =163a(15) =1a(16) =2a(17) =6a(18) =21a(19) =99a(20) =638a(21) =1a(22) =2a(23) =6a(24) =20a(25) =78a(26) =382a(27) =2510a(28) =1a(29) =2
External references
- oeis: A307665