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 A159790 #10 Feb 24 2021 02:48:18 %S A159790 0,0,0,1,1,0,2,7,7,2,0,1,1,4,18,35,35,22,12,5,-3,-8,-2,7,3,-6,-4,5,17, %T A159790 48,106,155,155,126,100,77,53,32,22,15,-5,-30,-44,-51,-55,-40,2,35,23, %U A159790 -10,-32,-47,-59,-52,-18,11,11,14,48,101,181,328,522,651,651,590,532 %N A159790 Toothpick number A139250(n) minus triangular number A000217(n). %H A159790 David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="/A000695/a000695_1.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.] %H A159790 N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a> %H A159790 OEIS Plot 2, <a href="/plot2a?name1=A000217&name2=A139250&tform1=untransformed&tform2=untransformed&shift=0&radiop1=matp&drawpoints=true&drawlines=true">Triangular numbers and toothpick numbers vs n</a> %K A159790 sign %O A159790 0,7 %A A159790 _Omar E. Pol_, May 03 2009 %E A159790 More terms from _R. J. Mathar_, May 04 2009