Number triangle with row sums given by quadruple factorial numbers A001813.

Terms

a(0) =1a(1) =1a(2) =1a(3) =7a(4) =4a(5) =1a(6) =71a(7) =39a(8) =9a(9) =1a(10) =1001a(11) =536a(12) =126a(13) =16a(14) =1a(15) =18089a(16) =9545a(17) =2270a(18) =310a(19) =25a(20) =1a(21) =398959a(22) =208524a(23) =49995a(24) =7120a(25) =645a(26) =36a(27) =1a(28) =10391023a(29) =5394991