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 A119532 #6 Jan 08 2023 13:03:16 %S A119532 2,2,2,3,8,16,47,132,435,1445,5103,18259,66934,247826,928137,3500559, %T A119532 13290552,50712016,194358380,747624825,2885120934,11164896416, %U A119532 43313276948,168400053019,656028153120,2560227845391,10007858038797,39178672900385,153586295761270,602842558581537,2368994981198048 %N A119532 Number of n-ominoes plus number of n-iamonds. %C A119532 Number of polyominoes with n cells plus number of polyiamonds with n cells. Turning over is allowed; holes are allowed. %F A119532 a(n) = A000105(n) + A000577(n). %Y A119532 Cf. A000105, A000577. %K A119532 nonn %O A119532 0,1 %A A119532 _Jonathan Vos Post_, May 28 2006 %E A119532 More terms from _John Mason_, Jan 08 2023