Triangle of second-order Eulerian numbers of type B.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =8a(5) =3a(6) =1a(7) =33a(8) =71a(9) =15a(10) =1a(11) =112a(12) =718a(13) =744a(14) =105a(15) =1a(16) =353a(17) =5270a(18) =14542a(19) =9129a(20) =945a(21) =1a(22) =1080a(23) =33057a(24) =191384a(25) =300291a(26) =129072a(27) =10395a(28) =1a(29) =3265