Irregular triangle read by rows: T(n,d) (n >= 1, 0 <= d <= 2n-2) = number of n X n integer-valued matrices M such that M_{1,1}=0, M_{n,n}=d, and M_{(i+1),j} = M_{i,j} + (0 or 1), M_{i,(j+1)} = M_{i,j} + (0 or 1).
A323849
Irregular triangle read by rows: T(n,d) (n >= 1, 0 <= d <= 2n-2) = number of n X n integer-valued matrices M such that M_{1,1}=0, M_{n,n}=d, and M_{(i+1),j} = M_{i,j} + (0 or 1), M_{i,(j+1)} = M_{i,j} + (0 or 1).
Terms
- a(0) =1a(1) =1a(2) =4a(3) =1a(4) =1a(5) =18a(6) =44a(7) =18a(8) =1a(9) =1a(10) =68a(11) =615a(12) =1236a(13) =615a(14) =68a(15) =1a(16) =1a(17) =250a(18) =7313a(19) =46812a(20) =84910a(21) =46812a(22) =7313a(23) =250a(24) =1a(25) =1a(26) =922a(27) =85801a(28) =1592348a(29) =8241540
External references
- oeis: A323849