Triangular array: the self-fusion of (p(n,x)), where p(n,x)=sum{(k+1)(n+1)*x^(n-k) : 0<=k<=n}.

Terms

a(0) =1a(1) =2a(2) =4a(3) =12a(4) =28a(5) =44a(6) =36a(7) =90a(8) =150a(9) =210a(10) =80a(11) =208a(12) =360a(13) =520a(14) =680a(15) =150a(16) =400a(17) =710a(18) =1050a(19) =1400a(20) =1750a(21) =252a(22) =684a(23) =1236a(24) =1860a(25) =2520a(26) =3192a(27) =3864a(28) =392a(29) =1078