A352562 a(n) = number of modules with n elements over the ring of integers in the imaginary quadratic field of discriminant -4.

1, 1, 0, 2, 2, 0, 0, 3, 1, 2, 0, 0, 2, 0, 0, 5, 2, 1, 0, 4, 0, 0, 0, 0, 5, 2, 0, 0, 2, 0, 0, 7, 0, 2, 0, 2, 2, 0, 0, 6, 2, 0, 0, 0, 2, 0, 0, 0, 1, 5, 0, 4, 2, 0, 0, 0, 0, 2, 0, 0, 2, 0, 0, 11, 4, 0, 0, 4, 0, 0, 0, 3, 2, 2, 0, 0, 0, 0, 0, 10, 2, 2, 0, 0, 4, 0, 0, 0, 2, 2, 0, 0, 0, 0, 0, 0, 2, 1, 0, 10, 2, 0, 0, 6, 0, 2, 0, 0, 2, 0, 0, 0, 2, 0, 0, 4, 2

Offset: 1

Author

N. J. A. Sloane, Mar 21 2022

Keywords

• nonn

Comments

See A352550 for comments and PARI code.

Crossrefs

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