Triangle T_4(n, m), the number of surjective multi-valued functions from {1, 1, 1, 1, 2, 3, ..., n-3} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).
A172108
Triangle T_4(n, m), the number of surjective multi-valued functions from {1, 1, 1, 1, 2, 3, ..., n-3} to {1, 2, 3, ..., m} by rows (n >= 1, 1 <= m <= n).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =3a(8) =3a(9) =1a(10) =1a(11) =8a(12) =18a(13) =16a(14) =5a(15) =1a(16) =18a(17) =78a(18) =136a(19) =105a(20) =30a(21) =1a(22) =38a(23) =288a(24) =856a(25) =1205a(26) =810a(27) =210a(28) =1a(29) =78
External references
- oeis: A172108