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 A170883 #9 Feb 24 2021 02:48:19 %S A170883 0,1,3,7,12,17,24,35,46,53,60,73,92,111,130,155,178,189,196,209,228, %T A170883 249,274,311,356,391,414,445,494,547,598,657,706,725,732,745,764,785, %U A170883 810,847,892,929,958,999,1064,1141,1218,1307,1404,1471,1502 %N A170883 "Corner" sequence associated with A161644 and A161645. %H A170883 David Applegate and N. J. A. Sloane, <a href="/A170883/b170883.txt">Table of n, a(n) for n = 0..1000</a> %H A170883 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 A170883 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 A170883 David Applegate, <a href="/A139250/a139250.anim.html">The movie version of A139250, etc.</a> [See A161644, corner version.] %Y A170883 Cf. A139250, A161644, A161645, A170882. %K A170883 nonn %O A170883 0,3 %A A170883 _David Applegate_ and _N. J. A. Sloane_, Jan 08 2010