Triangular array counting derangements by number of descents.

Terms

a(0) =1a(1) =2a(2) =0a(3) =4a(4) =4a(5) =1a(6) =8a(7) =24a(8) =12a(9) =0a(10) =16a(11) =104a(12) =120a(13) =24a(14) =1a(15) =32a(16) =392a(17) =896a(18) =480a(19) =54a(20) =0a(21) =64a(22) =1368a(23) =5544a(24) =5984a(25) =1764a(26) =108a(27) =1a(28) =128a(29) =4552