T(n,k) = Number of n X k nonnegative integer arrays with upper left 0 and lower right n+k-4 and value increasing by 0 or 1 with every step right or down.
A252876
T(n,k) = Number of n X k nonnegative integer arrays with upper left 0 and lower right n+k-4 and value increasing by 0 or 1 with every step right or down.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =1a(5) =1a(6) =3a(7) =8a(8) =8a(9) =3a(10) =6a(11) =26a(12) =44a(13) =26a(14) =6a(15) =10a(16) =61a(17) =153a(18) =153a(19) =61a(20) =10a(21) =15a(22) =120a(23) =413a(24) =615a(25) =413a(26) =120a(27) =15a(28) =21a(29) =211
External references
- oeis: A252876