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 A005749 M3530 #28 Oct 04 2017 00:08:10
%S A005749 4,16,152,2368,47688,1156000,32699080,1057082752,38444581640,
%T A005749 1553526946144,69054999618888,3348574955346496,175908582307762312,
%U A005749 9951733002164182048,603217074746723736776,39001136297834245139200,2679228986900726147063304
%N A005749 Cascade-realizable Boolean functions of n variables.
%D A005749 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H A005749 J. T. Butler, <a href="/A006447/a006447.pdf">Letter to N. J. A. Sloane, Jun. 1975</a>.
%H A005749 J. T. Butler, <a href="http://dx.doi.org/10.1109/T-C.1975.224288">On the number of functions realized by cascades and disjunctive networks</a>, IEEE Trans. Computers, C-24 (1975), 681-690. (<a href="/A005613/a005613.pdf">Annotated scanned copy</a>)
%H A005749 <a href="/index/Bo#Boolean">Index entries for sequences related to Boolean functions</a>
%F A005749 a(n) = Sum_{k=0..n} binomial(n, k) * A005613(k). - _Sean A. Irvine_, Aug 22 2016
%Y A005749 Cf. A005613.
%K A005749 nonn
%O A005749 1,1
%A A005749 _N. J. A. Sloane_
%E A005749 More terms from _Sean A. Irvine_, Aug 22 2016