1-Euler triangle.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =5a(8) =5a(9) =1a(10) =1a(11) =14a(12) =30a(13) =14a(14) =1a(15) =1a(16) =33a(17) =146a(18) =146a(19) =33a(20) =1a(21) =1a(22) =72a(23) =603a(24) =1168a(25) =603a(26) =72a(27) =1a(28) =1a(29) =151