A307277 Number of even, unimodular, positive definite lattices of dimension 4 over a real quadratic number field Q(sqrt(D)) of fundamental discriminant d = A306300(n).
1, 1, 2, 1, 1, 3, 4, 4, 3, 4, 3, 6, 3, 7, 6, 10, 7, 17, 6, 8, 13, 6, 13, 13, 14, 17, 10, 20, 18, 10, 15
Offset: 1
Links
- Britta Habdank-Eichelsbacher, Unimodulare Gitter über Reell-Quadratischen Zahlkörpern, Ergänzungsreihe 95-005, Univ. Bielefeld, 1995. See Section 4.2.