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 A202663 #7 Dec 28 2023 21:29:09 %S A202663 15,169,1483,9739,47713,238453,1186107,5914721,29498237,147102833, %T A202663 733637717,3658966867,18248551605,91011704581,453908063159, %U A202663 2263802495143,11290385910711,56309167233261,280833879734153,1400618531203889 %N A202663 Number of -7..7 arrays of n elements with first through fourth differences also in -7..7. %C A202663 Column 7 of A202664. %H A202663 R. H. Hardin, <a href="/A202663/b202663.txt">Table of n, a(n) for n = 1..210</a> %e A202663 Some solutions for n=5 %e A202663 ..7...-2...-5...-4...-3....0....7....0...-5....6....1....0...-2...-1....5....5 %e A202663 ..5....0...-3...-4....2....3....3...-4....0....3....1...-3...-5...-4...-1....7 %e A202663 ..7....0....2...-2....1....1....3...-1....0....0....1...-3...-6...-6...-6....4 %e A202663 ..7....2....5...-3...-1...-2....4....3...-3...-2....0...-3...-5...-4...-7....1 %e A202663 ..6....5....6...-5...-3...-2....0....7...-4....3...-6....1...-6....2...-5....5 %Y A202663 Cf. A202664. %K A202663 nonn %O A202663 1,1 %A A202663 _R. H. Hardin_, Dec 22 2011