a(n) = floor(C(n+6,6)/C(n+2,2)).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =14a(5) =22a(6) =33a(7) =47a(8) =66a(9) =91a(10) =121a(11) =158a(12) =204a(13) =258a(14) =323a(15) =399a(16) =487a(17) =590a(18) =708a(19) =843a(20) =996a(21) =1170a(22) =1365a(23) =1583a(24) =1827a(25) =2097a(26) =2397a(27) =2728a(28) =3091a(29) =3490