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 A254212 #12 Oct 27 2023 18:31:24 %S A254212 2,0,1,2,2,2,2,2,5,4,5,8,31,64,83,66,60,104,158,240,846,2990,6296, %T A254212 8440,10213,14034,16843,15538,20339,57766,202098,751354,2575608, %U A254212 6730882,12332861,15945860,15602393,13432584,12250132,12687426,23661609,144529800 %N A254212 Number of length n 1..(2+2) arrays with no leading or trailing partial sum equal to a prime and no consecutive values equal. %H A254212 Alois P. Heinz, <a href="/A254212/b254212.txt">Table of n, a(n) for n = 1..300</a> (first 51 terms from R. H. Hardin) %e A254212 All solutions for n=4: %e A254212 ..4....1 %e A254212 ..2....3 %e A254212 ..3....2 %e A254212 ..1....4 %Y A254212 Column k=2 of A254218. %K A254212 nonn %O A254212 1,1 %A A254212 _R. H. Hardin_, Jan 26 2015