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 A255712 #6 Jul 23 2025 15:10:04 %S A255712 3,8,26,81,261,936,3435,12406,45637,165303,579197,2056418,7724487, %T A255712 30188921,117283664,443965914,1645885655,6011641972,21768376301, %U A255712 79175516820,293501032240,1120198277690,4414668160947,17781778665225 %N A255712 Number of length n 1..(4+2) arrays with no leading partial sum equal to a prime and no consecutive values equal. %C A255712 Column 4 of A255716 %H A255712 R. H. Hardin, <a href="/A255712/b255712.txt">Table of n, a(n) for n = 1..210</a> %e A255712 Some solutions for n=4 %e A255712 ..4....4....1....6....4....6....4....4....6....1....6....6....4....1....6....6 %e A255712 ..6....2....3....3....5....2....2....6....4....5....2....3....5....5....2....3 %e A255712 ..4....6....6....6....1....1....6....5....2....3....1....5....1....2....6....5 %e A255712 ..1....3....5....5....2....6....2....6....6....5....5....4....4....1....1....1 %Y A255712 Cf. A255716 %K A255712 nonn %O A255712 1,1 %A A255712 _R. H. Hardin_, Mar 03 2015