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 A297537 #5 Feb 16 2025 08:33:52 %S A297537 1,1,8,9,1,125,196,1,2744,6084,1,74088,219024,1,2299968,8450649,1, %T A297537 78953589,338265664,1,2924207000,13840346025,1,114933031928, %U A297537 574510941225,1,4738245926336,24093764931600,1,203152294091656 %N A297537 Number of maximum independent vertex sets in the n-triangular honeycomb grid graph. %H A297537 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/MaximumIndependentVertexSet.html">Maximum Independent Vertex Set</a> %F A297537 a(3n) = A033536(n+1) = CatalanNumber(n+1)^3 %F A297537 a(3n-1) = 1 %F A297537 a(3n-2) = A244506(n). %Y A297537 Cf. A033536 (cubes of Catalan numbers). %Y A297537 Cf. A244506 (maximum independent vertex sets for mod(n,3) = 1). %K A297537 nonn %O A297537 1,3 %A A297537 _Eric W. Weisstein_, Dec 31 2017