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 A099185 #28 Feb 16 2025 08:32:54
%S A099185 2,6,146,2074806,5954444157018557346,
%T A099185 140744820294208035204656447906095566299588102457814757606
%N A099185 Iterated octahedral numbers, starting at a(0) = 2.
%C A099185 For additional terms see b-file.
%D A099185 Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, p. 50, 1996.
%D A099185 Dickson, L. E. History of the Theory of Numbers, Vol. 2: Diophantine Analysis. New York: Chelsea, 1952.
%H A099185 Vincenzo Librandi, <a href="/A099185/b099185.txt">Table of n, a(n) for n = 0..7</a>
%H A099185 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/OctahedralNumber.html">Octahedral Number</a>.
%F A099185 a(0) = 2, a(n+1) = oct(a(n)) = (2*a(n)^3 + a(n))/3.
%t A099185 RecurrenceTable[{a[0]==2, a[n+1]==(2 a[n]^3 + a[n])/3}, a, {n, 6}] (* _Vincenzo Librandi_, Sep 16 2018 *)
%Y A099185 Cf. A007501, A005900.
%K A099185 easy,nonn,less
%O A099185 0,1
%A A099185 _Jonathan Vos Post_, Nov 15 2004
%E A099185 Edited by _Jianing Song_, Sep 16 2018