Triangle read by rows: T(n,k) is number of (n-k) X k matrices, k=0..n, with nonnegative integer entries and every row and column sum <= 2.
A131235
Triangle read by rows: T(n,k) is number of (n-k) X k matrices, k=0..n, with nonnegative integer entries and every row and column sum <= 2.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =6a(8) =6a(9) =1a(10) =1a(11) =10a(12) =26a(13) =10a(14) =1a(15) =1a(16) =15a(17) =79a(18) =79a(19) =15a(20) =1a(21) =1a(22) =21a(23) =189a(24) =451a(25) =189a(26) =21a(27) =1a(28) =1a(29) =28
External references
- oeis: A131235