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

1,3

Links

Table of n, a(n) for n=1..31.

Britta Habdank-Eichelsbacher, Unimodulare Gitter über Reell-Quadratischen Zahlkörpern, Ergänzungsreihe 95-005, Univ. Bielefeld, 1995. See Section 4.2.

Crossrefs

Cf. A003658, A306300.

Sequence in context: A262953 A226209 A302097 * A210691 A262175 A278028

Adjacent sequences: A307274 A307275 A307276 * A307278 A307279 A307280

Keyword

nonn,more

Author

N. J. A. Sloane, Apr 03 2019

Status

approved