Number T(n,k) of occurrences of k in a (signed) displacement set of a permutation of [n] divided by |k|!; triangle T(n,k), n>=1, 1-n<=k<=n-1, read by rows.
A306234
Number T(n,k) of occurrences of k in a (signed) displacement set of a permutation of [n] divided by |k|!; triangle T(n,k), n>=1, 1-n<=k<=n-1, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =4a(7) =3a(8) =1a(9) =1a(10) =5a(11) =13a(12) =15a(13) =13a(14) =5a(15) =1a(16) =1a(17) =7a(18) =28a(19) =67a(20) =76a(21) =67a(22) =28a(23) =7a(24) =1a(25) =1a(26) =9a(27) =49a(28) =179a(29) =411
External references
- oeis: A306234