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

A178514

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

Terms

    a(0) =0a(1) =1a(2) =0a(3) =1a(4) =1a(5) =0a(6) =3a(7) =6a(8) =0a(9) =0a(10) =6a(11) =30a(12) =8a(13) =0a(14) =0a(15) =15a(16) =130a(17) =120a(18) =0a(19) =0a(20) =0a(21) =36a(22) =525a(23) =1113a(24) =180a(25) =0a(26) =0a(27) =0a(28) =91a(29) =2016

External references