1-sequence of reduction of (n^2) by x^2 -> x+1.

Terms

a(0) =0a(1) =4a(2) =13a(3) =45a(4) =120a(5) =300a(6) =692a(7) =1524a(8) =3225a(9) =6625a(10) =13280a(11) =26096a(12) =50432a(13) =96100a(14) =180925a(15) =337085a(16) =622328a(17) =1139756a(18) =2072580a(19) =3744980a(20) =6728345a(21) =12026209a(22) =21395328a(23) =37901760a(24) =66881760a(25) =117598660a(26) =206094157a(27) =360085869a(28) =627364920a(29) =1090171020