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 A278566 #17 Oct 14 2023 14:04:29 %S A278566 1,1,1,1,1,2,2,1,1,3,3,1,2,1,4,5,3,2,1,1,1 %N A278566 Irregular triangle read by rows: row n gives coefficients when the n-th coefficient of the modular function j (A000521(n)) is written as a linear combination of irreducible characters of the Monster simple group (A001379). %C A278566 The coefficients are given as in Thompson's paper. The choice of coefficients is actually ambiguous because of a linear relation with small coefficients between the terms of A001379 (see Wikipedia). - _Andrey Zabolotskiy_, Feb 12 2019 %H A278566 J. G. Thompson, <a href="https://doi.org/10.1112/blms/11.3.352">Some numerology between the Fischer-Griess Monster and the elliptic modular function</a>, Bull. London Math. Soc., 11 (1979), 352-353. %H A278566 Wikipedia, <a href="https://en.wikipedia.org/wiki/Monstrous_moonshine">Monstrous moonshine</a> %H A278566 <a href="/index/Gre#groups">Index entries for sequences related to groups</a> %H A278566 <a href="/index/Mat#McKay_Thompson">Index entries for McKay-Thompson series for Monster simple group</a> %e A278566 Triangle begins: %e A278566 1,1, %e A278566 1,1,1, %e A278566 2,2,1,1, %e A278566 3,3,1,2,1, %e A278566 4,5,3,2,1,1,1, %e A278566 ... %Y A278566 Cf. A000521, A001379, A007240, A055791. %K A278566 nonn,tabf,more %O A278566 1,6 %A A278566 _N. J. A. Sloane_, Nov 26 2016