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 A101874 #11 Sep 23 2023 04:29:38 %S A101874 1,1,1,1,1,1,3,1,1,1,1,1,1,1,1,2,1,1,2,1,1,1,1,1,2,1,1,1,1,1,1,1,1,3, %T A101874 1,1,2,1,1,1,1,1,2,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,7,1,1,1,1,1,1,1, %U A101874 2,2,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,3,1,3,1,1,2,1,1,3,1,1,2,1,1,1,1,1,1,1,1 %N A101874 Number of Abelian groups of order 4n+3. %t A101874 a[n_] := FiniteAbelianGroupCount[4*n + 3]; Array[a, 100, 0] (* _Amiram Eldar_, Sep 23 2023 *) %Y A101874 Bisection of A101871. %Y A101874 Cf. A101873, A101876. %K A101874 nonn,easy %O A101874 0,7 %A A101874 _N. J. A. Sloane_, Jan 28 2005 %E A101874 More terms from _Joshua Zucker_, May 10 2006