Triangle T_3(n, m), the number of surjective multi-valued functions from {1, 1, 1, 2, 3, ..., n-2} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).
A172107
Triangle T_3(n, m), the number of surjective multi-valued functions from {1, 1, 1, 2, 3, ..., n-2} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =1a(6) =1a(7) =6a(8) =9a(9) =4a(10) =1a(11) =14a(12) =45a(13) =52a(14) =20a(15) =1a(16) =30a(17) =177a(18) =388a(19) =360a(20) =120a(21) =1a(22) =62a(23) =621a(24) =2260a(25) =3740a(26) =2880a(27) =840a(28) =1a(29) =126
External references
- oeis: A172107