Number T(n,k) of permutations of [n] having exactly k consecutive 3-term arithmetic progressions; triangle T(n,k), n>=0, 0<=k<=max(n-2,0), read by rows.
A295390
Number T(n,k) of permutations of [n] having exactly k consecutive 3-term arithmetic progressions; triangle T(n,k), n>=0, 0<=k<=max(n-2,0), read by rows.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =2a(5) =18a(6) =4a(7) =2a(8) =80a(9) =34a(10) =4a(11) =2a(12) =482a(13) =196a(14) =36a(15) =4a(16) =2a(17) =3280a(18) =1418a(19) =292a(20) =44a(21) =4a(22) =2a(23) =26244a(24) =11292a(25) =2426a(26) =304a(27) =48a(28) =4a(29) =2
External references
- oeis: A295390