Table T(n,k) giving number of permutations of [1..n] with order dividing k, read by antidiagonals.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =4a(8) =1a(9) =1a(10) =1a(11) =10a(12) =3a(13) =2a(14) =1a(15) =1a(16) =26a(17) =9a(18) =4a(19) =1a(20) =1a(21) =1a(22) =76a(23) =21a(24) =16a(25) =1a(26) =2a(27) =1a(28) =1a(29) =232