Triangle read by rows: T(n,k) is the number of tree-rooted loopless planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.

A342985

Triangle read by rows: T(n,k) is the number of tree-rooted loopless planar maps with n edges, k faces and no isthmuses, n >= 0, k = 1..n+1.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =0a(4) =2a(5) =0a(6) =0a(7) =3a(8) =3a(9) =0a(10) =0a(11) =4a(12) =36a(13) =4a(14) =0a(15) =0a(16) =5a(17) =135a(18) =135a(19) =5a(20) =0a(21) =0a(22) =6a(23) =360a(24) =1368a(25) =360a(26) =6a(27) =0a(28) =0a(29) =7

External references