1-sequence of reduction of triangular number sequence by x^2 -> x+1.

Terms

a(0) =0a(1) =3a(2) =9a(3) =29a(4) =74a(5) =179a(6) =403a(7) =871a(8) =1816a(9) =3686a(10) =7316a(11) =14258a(12) =27362a(13) =51827a(14) =97067a(15) =180027a(16) =331038a(17) =604125a(18) =1095085a(19) =1973095a(20) =3535810a(21) =6305148a(22) =11193384a(23) =19790484a(24) =34860084a(25) =61193859a(26) =107080413a(27) =186826121a(28) =325073906a(29) =564190391