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

Terms

a(0) =1a(1) =1a(2) =11a(3) =31a(4) =101a(5) =269a(6) =689a(7) =1649a(8) =3794a(9) =8414a(10) =18138a(11) =38158a(12) =78653a(13) =159293a(14) =317733a(15) =625365a(16) =1216455a(17) =2341635a(18) =4465645a(19) =8445005a(20) =15849556a(21) =29541916a(22) =54717716a(23) =100766316a(24) =184588041a(25) =336489609a(26) =610630959a(27) =1103486539a(28) =1986385449a(29) =3562728009