This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A038540 #24 Mar 21 2022 11:21:05 %S A038540 1,1,2,2,1,2,0,3,5,1,0,4,2,0,2,5,0,5,0,2,0,0,0,6,2,2,10,0,0,2,2,7,0,0, %T A038540 0,10,2,0,4,3,2,0,2,0,5,0,0,10,1,2,0,4,2,10,0,0,0,0,0,4,0,2,0,11,2,0, %U A038540 2,0,0,0,2,15,0,2,4,0,0,4,2,5,20,2,2,0,0,2,0,0,2,5,0,0,4,0,0,14 %N A038540 a(n) = number of modules with n elements over the ring of integers in the real quadratic field of discriminant 40. %C A038540 Equivalently, number of modules with n elements over ring Z[sqrt(10)]. %C A038540 See A352550 for comments and PARI code. %Y A038540 Cf. A038540, A038541, A248107, A352550-A352567. %K A038540 nonn,mult %O A038540 1,3 %A A038540 Paolo Dominici (pl.dm(AT)libero.it) %E A038540 Edited by _M. F. Hasler_, Feb 18 2022 %E A038540 Revised by _N. J. A. Sloane_, Mar 21 2022