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 A341823 #27 Mar 07 2021 18:04:43 %S A341823 2,3,4,7,11,19,34,70 %N A341823 Number of finite groups G with |Aut(G)| = 2^n. %C A341823 This sequence is infinite, but the amount of computation needed to consider the large number of groups of order 2^8 suggests it may be hard to find the next term. %H A341823 J. Flynn, D. MacHale, E. A. O'Brien and R. Sheehy, <a href="https://www.jstor.org/stable/20489479">Finite Groups whose Automorphism Groups are 2-groups</a>, Proc. Royal Irish Academy, 94A, (2) 1994, 137-145. %e A341823 a(3) = 7, because there are seven finite groups G with |Aut(G)| = 8. Four cyclic groups: Aut(C_15) = Aut(C_16) = Aut(C_20) = Aut(C_30) ~~ C_4 x C_2, also Aut(C_4 x C_2) = Aut(D_4) ~~ D_4, with D_4 is the dihedral group of the square, finally Aut(C_24) ~~ C_2 x C_2 x C_2 = (C_2)^3 where ~~ stands for “isomorphic to". - _Bernard Schott_, Mar 04 2021 %Y A341823 Cf. A341824, A341825. %Y A341823 Subsequence of A340521. %K A341823 nonn,more %O A341823 0,1 %A A341823 _Des MacHale_, Feb 20 2021 %E A341823 Offset modified by _Bernard Schott_, Mar 04 2021