Array read by antidiagonals: A(n,k) is the number of nonnegative integer matrices with k columns and any number of nonzero rows with column sums n and columns in nonincreasing lexicographic order.
A331315
Array read by antidiagonals: A(n,k) is the number of nonnegative integer matrices with k columns and any number of nonzero rows with column sums n and columns in nonincreasing lexicographic order.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =2a(8) =2a(9) =1a(10) =1a(11) =4a(12) =14a(13) =4a(14) =1a(15) =1a(16) =8a(17) =150a(18) =128a(19) =8a(20) =1a(21) =1a(22) =16a(23) =2210a(24) =10848a(25) =1288a(26) =16a(27) =1a(28) =1a(29) =32
External references
- oeis: A331315