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 A204211 #7 Jun 02 2025 07:37:45 %S A204211 1,7,49,434,4116,41363,431445,4629851,50775347,566592411,6412416619, %T A204211 73428973184,849204106870,9904511238159,116368090860251, %U A204211 1375981128400665,16362074062371685,195540534817518299,2347344805869798781 %N A204211 Number of length n+1 nonnegative integer arrays starting and ending with 0 with adjacent elements differing by no more than 6. %C A204211 Column 6 of A204213 %H A204211 R. H. Hardin, <a href="/A204211/b204211.txt">Table of n, a(n) for n = 1..210</a> %e A204211 Some solutions for n=5 %e A204211 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0 %e A204211 ..4....3....3....0....5....0....0....4....2....3....6....4....1....6....6....2 %e A204211 ..9....1....6....5....1....1....4....5....5....6...12....1....0....2....0....2 %e A204211 ..4....3...10....6....4....4....2....1....4....5...11....6....4....3....1....8 %e A204211 ..5....1....5....5....1....1....5....0....1....5....6....1....1....5....0....5 %e A204211 ..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0 %K A204211 nonn %O A204211 1,2 %A A204211 _R. H. Hardin_ Jan 12 2012