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 A068870 #23 Nov 03 2023 11:21:20 %S A068870 1,1,1,2,7,26,147,1019,8699,82535,846042,9078720 %N A068870 Number of polyhypercubes or 4-dimensional polyominoes with n cells (regarding mirror-images as identical). %H A068870 Don Reble, <a href="/A068870/a068870.txt">C++ Program</a> %Y A068870 Excluding a(0), 140th row of A366766. %Y A068870 Cf. A049429, A049430, A255487. %K A068870 hard,nonn,more %O A068870 0,4 %A A068870 _Franklin T. Adams-Watters_, Mar 29 2002 %E A068870 a(10) and a(11) from _Don Reble_, Feb 25 2015. - _N. J. A. Sloane_, Mar 01 2015