Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive pattern 45321; triangle T(n,k), n >= 0, 0 <= k <= max(0, floor((n-1)/4)), read by rows.
A264781
Number T(n,k) of permutations of [n] with exactly k (possibly overlapping) occurrences of the consecutive pattern 45321; triangle T(n,k), n >= 0, 0 <= k <= max(0, floor((n-1)/4)), read by rows.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =24a(5) =119a(6) =1a(7) =708a(8) =12a(9) =4914a(10) =126a(11) =38976a(12) =1344a(13) =347765a(14) =15110a(15) =5a(16) =3447712a(17) =180736a(18) =352a(19) =37598286a(20) =2308548a(21) =9966a(22) =447294144a(23) =31481472a(24) =225984a(25) =5764747515a(26) =457520055a(27) =4753185a(28) =45a(29) =80011430240
External references
- oeis: A264781