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 A202662 #7 Jun 02 2025 07:26:39 %S A202662 13,127,967,5509,23425,101567,438177,1895197,8198571,35463355, %T A202662 153408903,663650521,2870932567,12419542739,53726653631,232420358051, %U A202662 1005444905517,4349531110857,18815972516807,81397465699935,352123564686167 %N A202662 Number of -6..6 arrays of n elements with first through fourth differences also in -6..6. %C A202662 Column 6 of A202664 %H A202662 R. H. Hardin, <a href="/A202662/b202662.txt">Table of n, a(n) for n = 1..210</a> %e A202662 Some solutions for n=5 %e A202662 .-2....1...-1...-4....3...-1...-6....2....0....3....0...-4...-2...-4....5...-6 %e A202662 .-6....2....0....0....3...-2...-3....4...-3....5...-4....0...-4...-3...-1...-3 %e A202662 .-4....4....1....0....5...-1...-1....4...-5....6...-2....0...-4...-1...-4....0 %e A202662 .-1....5....2....1....5....3....2....3...-4....5....1...-1...-4....0...-6...-1 %e A202662 ..3....6....2....3....5....6....6...-1....2....0....6...-2...-6....4...-5...-4 %K A202662 nonn %O A202662 1,1 %A A202662 _R. H. Hardin_ Dec 22 2011