Number of n-dimensional determinant 3 lattices.

Terms

a(0) =0a(1) =1a(2) =2a(3) =2a(4) =2a(5) =2a(6) =3a(7) =3a(8) =4a(9) =5a(10) =7a(11) =8a(12) =10a(13) =13a(14) =19a(15) =24a(16) =36a(17) =53