Triangle read by rows: T(n,k) gives the number of permutations of length n containing exactly k instances of the 1-box pattern; 0 <= k <= n.

A346462

Triangle read by rows: T(n,k) gives the number of permutations of length n containing exactly k instances of the 1-box pattern; 0 <= k <= n.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =0a(4) =0a(5) =2a(6) =0a(7) =0a(8) =4a(9) =2a(10) =2a(11) =0a(12) =10a(13) =4a(14) =8a(15) =14a(16) =0a(17) =40a(18) =10a(19) =42a(20) =14a(21) =90a(22) =0a(23) =230a(24) =40a(25) =226a(26) =80a(27) =54a(28) =646a(29) =0

External references