a(n) = A165966(n)/12.

Terms

a(0) =3a(1) =10a(2) =23a(3) =25a(4) =213a(5) =270a(6) =455a(7) =688a(8) =1060a(9) =1953a(10) =2233a(11) =2915a(12) =3468a(13) =3838a(14) =4718a(15) =4945a(16) =8645a(17) =10230a(18) =11638a(19) =12308a(20) =13090a(21) =15428a(22) =16250a(23) =19295a(24) =23095a(25) =27778a(26) =29435a(27) =32230a(28) =33488a(29) =43053