Triangular array: the fission of (p(n,x)) by ((2x+1)^n), where p(n,x)=(x+1)^n.

Terms

a(0) =1a(1) =1a(2) =5a(3) =1a(4) =8a(5) =19a(6) =1a(7) =11a(8) =43a(9) =65a(10) =1a(11) =14a(12) =76a(13) =194a(14) =211a(15) =1a(16) =17a(17) =118a(18) =422a(19) =793a(20) =665a(21) =1a(22) =20a(23) =169a(24) =776a(25) =2059a(26) =3044a(27) =2059a(28) =1a(29) =23