Array read by antidiagonals: A(n,k) is the number of nonnegative integer matrices with k distinct columns and any number of nonzero rows with column sums n and rows in nonincreasing lexicographic order.
A331161
Array read by antidiagonals: A(n,k) is the number of nonnegative integer matrices with k distinct columns and any number of nonzero rows with column sums n and rows in nonincreasing lexicographic order.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =0a(4) =1a(5) =1a(6) =0a(7) =1a(8) =2a(9) =1a(10) =0a(11) =1a(12) =7a(13) =3a(14) =1a(15) =0a(16) =1a(17) =43a(18) =28a(19) =5a(20) =1a(21) =0a(22) =1a(23) =403a(24) =599a(25) =104a(26) =7a(27) =1a(28) =0a(29) =1
External references
- oeis: A331161