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 A133887 #11 Apr 26 2023 20:15:19
%S A133887 1,8,36,22,36,8,1,2,16,23,44,23,16,2,3,24,10,17,10,24,3,4,32,46,39,46,
%T A133887 32,4,5,40,33,12,33,40,5,6,48,20,34,20,48,6,7,7,7,7,7,7,7,8,15,43,29,
%U A133887 43,15,8,9,23,30,2,30,23,9,10,31,17,24,17,31,10,11,39,4,46,4,39,11,12,47
%N A133887 Binomial(n+7,n) mod 7^2.
%C A133887 Periodic with length 7^3=343.
%H A133887 Ray Chandler, <a href="/A133887/b133887.txt">Table of n, a(n) for n = 0..1500</a>
%H A133887 <a href="/index/Rec#order_337">Index entries for linear recurrences with constant coefficients</a>, order 337.
%F A133887 a(n)=binomial(n+7,7) mod 7^2.
%F A133887 G.f. g(x)=sum{0<=k<343, a(k)*x^k}/(1-x^343).
%t A133887 Table[Mod[Binomial[n+7,n],49],{n,0,80}] (* _Harvey P. Dale_, Apr 08 2018 *)
%Y A133887 Cf. A000040, A133620-A133625, A133630, A038509, A133634-A133636.
%Y A133887 Cf. A133877, A133880, A133890, A133900, A133910.
%Y A133887 For the sequence regarding binomial(n+7, n) mod 7 see A133877.
%K A133887 nonn
%O A133887 0,2
%A A133887 _Hieronymus Fischer_, Oct 10 2007