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 A000725 M2181 N0873 #29 Feb 03 2022 00:46:13
%S A000725 1,2,154,2270394624,571030462095782973206774552784,
%T A000725 3824475917061034074298122508414160251634847335755905881951011420229530501911521280
%N A000725 Invertible Boolean functions of n variables.
%C A000725 Equivalence classes of invertible maps from {0,1}^n to {0,1}^n, under action of permutation of variables on the domain and permutation and complementation of the range. [_Sean A. Irvine_, Mar 16 2011]
%D A000725 M. A. Harrison, The number of classes of invertible Boolean functions, J. ACM 10 (1963), 25-28.
%D A000725 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
%D A000725 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A000725 M. A. Harrison, <a href="/A000653/a000653.pdf">The number of classes of invertible Boolean functions</a>, J. ACM 10 (1963), 25-28. [Annotated scan of page 27 only]
%H A000725 <a href="/index/Bo#Boolean">Index entries for sequences related to Boolean functions</a>
%K A000725 nonn
%O A000725 1,2
%A A000725 _N. J. A. Sloane_
%E A000725 More terms from _Sean A. Irvine_, Mar 15 2011
%E A000725 a(6) corrected by _Sean A. Irvine_, May 29 2013
%E A000725 a(5) corrected by _Sean A. Irvine_, Jun 03 2013