Triangle read by rows: T(n,k) is the number of tree-rooted planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.
A342987
Triangle read by rows: T(n,k) is the number of tree-rooted planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =0a(4) =2a(5) =2a(6) =0a(7) =3a(8) =15a(9) =5a(10) =0a(11) =4a(12) =60a(13) =84a(14) =14a(15) =0a(16) =5a(17) =175a(18) =650a(19) =420a(20) =42a(21) =0a(22) =6a(23) =420a(24) =3324a(25) =5352a(26) =1980a(27) =132a(28) =0a(29) =7
External references
- oeis: A342987