Riordan array (1/(1-x),x(1+x)/(1-x)^2).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =9a(8) =7a(9) =1a(10) =1a(11) =16a(12) =26a(13) =10a(14) =1a(15) =1a(16) =25a(17) =70a(18) =52a(19) =13a(20) =1a(21) =1a(22) =36a(23) =155a(24) =190a(25) =87a(26) =16a(27) =1a(28) =1a(29) =49