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 A257059 #7 Jun 02 2025 11:46:22 %S A257059 1,4,18,81,1024,7353,106056,1249592,22143847,282475249,8589934592, %T A257059 133642251792,3531308221901,71789886480657,2171807721018968, %U A257059 45949729863572161,2218611106740436992,53241469411989452625 %N A257059 Number of length n 1..(n+1) arrays with every leading partial sum divisible by 2 or 3. %C A257059 Diagonal of A257062 %H A257059 R. H. Hardin, <a href="/A257059/b257059.txt">Table of n, a(n) for n = 1..93</a> %e A257059 Some solutions for n=4 %e A257059 ..3....4....2....2....3....3....4....4....4....2....2....3....4....2....3....4 %e A257059 ..5....5....2....1....1....3....2....5....4....2....1....1....5....4....5....4 %e A257059 ..2....5....2....5....2....3....2....3....1....5....5....4....5....2....4....4 %e A257059 ..4....1....4....1....4....1....4....2....3....3....4....1....2....1....2....2 %Y A257059 Cf. A257062 %K A257059 nonn %O A257059 1,2 %A A257059 _R. H. Hardin_, Apr 15 2015