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 A028371 #24 Jul 08 2025 18:32:48 %S A028371 1,24,322560,21424936845312000, %T A028371 8829205774994708066835865418197893120000000 %N A028371 a(n) = (2^(n-1)-1)!*2^((2^(n-1)-1)-1). %H A028371 Vincenzo Librandi, <a href="/A028371/b028371.txt">Table of n, a(n) for n = 2..9</a> %H A028371 I. Strazdins, <a href="http://dx.doi.org/10.1023/A:1005769927571">Universal affine classification of Boolean functions</a>, Acta Applic. Math. 46 (1997), 147-167. %F A028371 a(n) = A002866(2^(n-1)-1). %o A028371 (Magma) [(Factorial(2^(n-1)-1))*2^((2^(n-1)-1)-1): n in [2..8]]; // _Vincenzo Librandi_, Jun 03 2011 %Y A028371 Cf. A002866. %K A028371 nonn %O A028371 2,2 %A A028371 _N. J. A. Sloane_