Triangle read by rows: T(n,k) is the number of permutations of [n] having k adjacent 3-cycles (0 <= k <= floor(n/3)), i.e., having k cycles of the form (i, i+1, i+2).
A177250
Triangle read by rows: T(n,k) is the number of permutations of [n] having k adjacent 3-cycles (0 <= k <= floor(n/3)), i.e., having k cycles of the form (i, i+1, i+2).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =1a(5) =22a(6) =2a(7) =114a(8) =6a(9) =697a(10) =22a(11) =1a(12) =4923a(13) =114a(14) =3a(15) =39612a(16) =696a(17) =12a(18) =357899a(19) =4923a(20) =57a(21) =1a(22) =3588836a(23) =39612a(24) =348a(25) =4a(26) =39556420a(27) =357900a(28) =2460a(29) =20
External references
- oeis: A177250