Triangle read by rows: T(n,k) is the number of nonseparable rooted toroidal maps with n edges and k faces, n >= 2, k = 1..n-1.
A342989
Triangle read by rows: T(n,k) is the number of nonseparable rooted toroidal maps with n edges and k faces, n >= 2, k = 1..n-1.
Terms
- a(0) =1a(1) =4a(2) =4a(3) =10a(4) =39a(5) =10a(6) =20a(7) =190a(8) =190a(9) =20a(10) =35a(11) =651a(12) =1568a(13) =651a(14) =35a(15) =56a(16) =1792a(17) =8344a(18) =8344a(19) =1792a(20) =56a(21) =84a(22) =4242a(23) =33580a(24) =64667a(25) =33580a(26) =4242a(27) =84a(28) =120a(29) =8988
External references
- oeis: A342989