Triangle read by rows: T(n,k) is the number of indecomposable (connected) permutations of {1,2,...,n} having genus k (see first comment for definition of genus).
A185209
Triangle read by rows: T(n,k) is the number of indecomposable (connected) permutations of {1,2,...,n} having genus k (see first comment for definition of genus).
Terms
- a(0) =1a(1) =1a(2) =0a(3) =2a(4) =1a(5) =0a(6) =5a(7) =8a(8) =0a(9) =0a(10) =14a(11) =49a(12) =8a(13) =0a(14) =0a(15) =42a(16) =268a(17) =151a(18) =0a(19) =0a(20) =0a(21) =132a(22) =1375a(23) =1760a(24) =180a(25) =0a(26) =0a(27) =0a(28) =429a(29) =6768
External references
- oeis: A185209