Triangle of Eulerian numbers with rows multiplied by 1 + x.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =5a(8) =5a(9) =1a(10) =1a(11) =12a(12) =22a(13) =12a(14) =1a(15) =1a(16) =27a(17) =92a(18) =92a(19) =27a(20) =1a(21) =1a(22) =58a(23) =359a(24) =604a(25) =359a(26) =58a(27) =1a(28) =1a(29) =121