Duplicate of A210249.

Terms

a(0) =0a(1) =0a(2) =1a(3) =1a(4) =3a(5) =4a(6) =8a(7) =10a(8) =18a(9) =23a(10) =37a(11) =47a(12) =71a(13) =90a(14) =131a(15) =164a(16) =230a(17) =288a(18) =393a(19) =488a(20) =653a(21) =807a(22) =1060a(23) =1303a(24) =1686a(25) =2063a(26) =2637a(27) =3210a(28) =4057a(29) =4920