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 A144868 #11 Sep 19 2019 23:03:15 %S A144868 1,1,1,3,2,4,1,4,3,3,7,6,7,1,5,4,7,5,7,6,1,12,7,10,4,12,3,1,7,9,7,4, %T A144868 15,12,1,12,7,12,16,11,7,1,7,22,10,12,7,11,1,6,16,22,7,6,16,6,16,12,7, %U A144868 18,7,12,4,4,20,27,7,24,16,6,7,19,7,12,9,22,4,27,7,11,3,12,7,5,17,12,15,36,7 %N A144868 Shadow transform of C(n+6,7) = A000580(n+6). %H A144868 Alois P. Heinz, <a href="/A144868/b144868.txt">Table of n, a(n) for n = 1..10000</a> %H A144868 Lorenz Halbeisen and Norbert Hungerbuehler, <a href="https://www.semanticscholar.org/paper/Number-theoretic-aspects-of-a-combinatorial-Halbeisen-Hungerb%C3%BChler/5743ff2f9c14d22d1a9e570d6951a7c9ef79a612">Number theoretic aspects of a combinatorial function</a>, Notes on Number Theory and Discrete Mathematics 5(4) (1999), 138-150; see Definition 7 for the shadow transform. %H A144868 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>. %p A144868 a:= n-> add(`if`(modp(binomial(j+6, 7), n)=0, 1, 0), j=0..n-1): %p A144868 seq(a(n), n=1..120); %Y A144868 7th column of A144871. %Y A144868 Cf. A007318. %K A144868 nonn %O A144868 1,4 %A A144868 _Alois P. Heinz_, Sep 23 2008