Triangle read by rows: T(n,k) is the number of non-derangement permutations of {1,2,...,n} having genus k (see first comment for definition of genus).

A178517

Triangle read by rows: T(n,k) is the number of non-derangement permutations of {1,2,...,n} having genus k (see first comment for definition of genus).

Terms

    a(0) =1a(1) =1a(2) =0a(3) =4a(4) =0a(5) =0a(6) =11a(7) =4a(8) =0a(9) =0a(10) =36a(11) =40a(12) =0a(13) =0a(14) =0a(15) =117a(16) =290a(17) =48a(18) =0a(19) =0a(20) =0a(21) =393a(22) =1785a(23) =1008a(24) =0a(25) =0a(26) =0a(27) =0a(28) =1339a(29) =9996

External references