Triangle read by rows: number of simsun n-permutations with k descents.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =11a(7) =4a(8) =1a(9) =26a(10) =34a(11) =1a(12) =57a(13) =180a(14) =34a(15) =1a(16) =120a(17) =768a(18) =496a(19) =1a(20) =247a(21) =2904a(22) =4288a(23) =496a(24) =1a(25) =502a(26) =10194a(27) =28768a(28) =11056a(29) =1