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 A153568 #5 Apr 28 2021 00:10:50 %S A153568 1,2,8,64,848,9949,298247,16406435,1545911495,236576023548, %T A153568 58010755690276,25220215282781623 %N A153568 Number of planar n X n X n binary triangular grids with no more than 6 ones in any similarly oriented 5 X 5 X 5 subtriangle. %K A153568 nonn %O A153568 0,2 %A A153568 _R. H. Hardin_, Jan 01 2009