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 A336267 #15 Nov 04 2022 11:32:57 %S A336267 1,6,24,181,941,4662,23691,119271,603760,3050402,15428576,78004550, %T A336267 394462578,1994595585,10086050889,51001111356,257894037378, %U A336267 1304071170194,6594196094078,33344335235915,168609627579175,852594638783225,4311246376730011 %N A336267 Number of free polyominoes of width 3 and height n. %C A336267 The sequence can be generated using a series of recursive formulas in a fashion similar to A353067. - _John Mason_, Nov 04 2022 %H A336267 John Mason, <a href="/A336267/b336267.txt">Table of n, a(n) for n = 1..400</a> %e A336267 a(2)=6, bounding box 2 X 3 as in A335711. %Y A336267 Cf. A268371, A335711, A353067. %K A336267 nonn %O A336267 1,2 %A A336267 _Jean-Luc Manguin_, Jul 15 2020 %E A336267 More terms from _John Mason_, Nov 04 2022