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a(n) = number of modules with n elements over the ring of integers in the imaginary quadratic field of discriminant -19.
19

%I #7 Mar 21 2022 11:28:26

%S 1,0,0,1,2,0,2,0,1,0,2,0,0,0,0,2,2,0,1,2,0,0,2,0,5,0,0,2,0,0,0,0,0,0,

%T 4,1,0,0,0,0,0,0,2,2,2,0,2,0,5,0,0,0,0,0,4,0,0,0,0,0,2,0,2,3,0,0,0,2,

%U 0,0,0,0,2,0,0,1,4,0,0,4,2,0,2,0,4,0,0,0,0,0,0,2,0,0,2,0,0,0,2,5,2,0,0,0,0,0,0,0,0,0,0,4,0,0,4,0

%N a(n) = number of modules with n elements over the ring of integers in the imaginary quadratic field of discriminant -19.

%C See A352550 for comments and PARI code.

%Y Cf. A038540, A038541, A248107, A352550-A352566.

%K nonn

%O 1,5

%A _N. J. A. Sloane_, Mar 21 2022