Triangle read by rows: T(n, k) = number of permutations that are k "block reversals" away from 12...n, for n >= 0, and (for n>0) 0 <= k <= n-1.

A300003

Triangle read by rows: T(n, k) = number of permutations that are k "block reversals" away from 12...n, for n >= 0, and (for n>0) 0 <= k <= n-1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =2a(7) =1a(8) =6a(9) =15a(10) =2a(11) =1a(12) =10a(13) =52a(14) =55a(15) =2a(16) =1a(17) =15a(18) =129a(19) =389a(20) =184a(21) =2a(22) =1a(23) =21a(24) =266a(25) =1563a(26) =2539a(27) =648a(28) =2a(29) =1

External references