Triangle of 2-Eulerian numbers.

Terms

a(0) =1a(1) =1a(2) =2a(3) =1a(4) =7a(5) =4a(6) =1a(7) =18a(8) =33a(9) =8a(10) =1a(11) =41a(12) =171a(13) =131a(14) =16a(15) =1a(16) =88a(17) =718a(18) =1208a(19) =473a(20) =32a(21) =1a(22) =183a(23) =2682a(24) =8422a(25) =7197a(26) =1611a(27) =64a(28) =1a(29) =374