Convolution of the lower and upper Wythoff sequences (A000201 and A001950).

Terms

a(0) =2a(1) =11a(2) =30a(3) =63a(4) =117a(5) =194a(6) =298a(7) =434a(8) =604a(9) =816a(10) =1072a(11) =1375a(12) =1735a(13) =2151a(14) =2628a(15) =3172a(16) =3783a(17) =4471a(18) =5237a(19) =6083a(20) =7019a(21) =8042a(22) =9162a(23) =10382a(24) =11702a(25) =13136a(26) =14680a(27) =16339a(28) =18122a(29) =20025