A352555 a(n) = number of modules with n elements over the ring of integers in the real quadratic field of discriminant 21.

1, 0, 1, 1, 2, 0, 1, 0, 2, 0, 0, 1, 0, 0, 2, 2, 2, 0, 0, 2, 1, 0, 0, 0, 5, 0, 3, 1, 0, 0, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 0, 2, 0, 4, 0, 2, 2, 2, 0, 2, 0, 0, 0, 0, 0, 0, 0, 2, 2, 0, 0, 2, 3, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 2, 4, 5, 0, 2, 1, 4, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 2, 0, 0, 0, 2, 0, 0, 3, 2, 0, 2, 2, 0, 0, 0, 0, 0, 0

Offset

1,5

Comments

See A352550 for comments and PARI code.

Links

Table of n, a(n) for n=1..118.

Crossrefs

Cf. A038540, A038541, A248107, A352550-A352567.

Sequence in context: A254001 A089734 A321375 * A307831 A217564 A325200

Adjacent sequences: A352552 A352553 A352554 * A352556 A352557 A352558

Keyword

nonn

Author

N. J. A. Sloane, Mar 20 2022

Status

approved