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 A279283 #10 Feb 16 2025 08:33:37
%S A279283 0,1,8,52,304,1650,8492,42000,201356,941367,4310480,19395042,85972228,
%T A279283 376185250,1627518840,6971209090,29595604656,124648174343,
%U A279283 521225809112,2165408553994,8942942384500,36733935375275,150138939637144,610840125062072,2474686297520984,9986301300789540
%N A279283 Self-composition of the tetrahedral (or triangular pyramidal) numbers; g.f.: A(x) = G(G(x)), where G(x) = g.f. of A000292.
%H A279283 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%H A279283 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/TetrahedralNumber.html">Tetrahedral Number</a>
%H A279283 <a href="/index/Ps#pyramidal_numbers">Index to sequences related to pyramidal numbers</a>
%H A279283 <a href="/index/Rec#order_16">Index entries for linear recurrences with constant coefficients</a>, signature (20,-174,876,-2885,6708,-11612,15476,-16206,13468,-8894,4632,-1868,564,-120,16,-1).
%F A279283 G.f.: x*(1 - x)^12/(1 - 5*x + 6*x^2 - 4*x^3 + x^4)^4.
%t A279283 CoefficientList[Series[x (1 - x)^12/(1 - 5 x + 6 x^2 - 4 x^3 + x^4)^4, {x, 0, 25}], x]
%t A279283 LinearRecurrence[{20,-174,876,-2885,6708,-11612,15476,-16206,13468,-8894,4632,-1868,564,-120,16,-1},{0,1,8,52,304,1650,8492,42000,201356,941367,4310480,19395042,85972228,376185250,1627518840,6971209090},40] (* _Harvey P. Dale_, Jul 26 2018 *)
%Y A279283 Cf. A000292, A030280.
%K A279283 nonn,easy
%O A279283 0,3
%A A279283 _Ilya Gutkovskiy_, Dec 09 2016