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 A254203 #5 Jul 23 2025 14:32:24 %S A254203 5,16,68,315,1653,9126,50166,266060,1445197,8388620,49943639, %T A254203 291356973,1672450652,9817427902,60070829938,373040809711, %U A254203 2261787393319 %N A254203 Number of length n 1..(7+2) arrays with no leading or trailing partial sum equal to a prime. %C A254203 Column 7 of A254204 %e A254203 Some solutions for n=4 %e A254203 ..8....9....6....4....6....9....8....9....4....4....1....4....9....8....4....8 %e A254203 ..7....7....2....2....4....9....6....9....8....2....8....8....7....4....6....4 %e A254203 ..6....5....7....3....6....7....4....9....8....2....9....9....6....6....4....6 %e A254203 ..9....9....9....1....6....9....8....9....8....8....9....1....8....4....4....6 %K A254203 nonn %O A254203 1,1 %A A254203 _R. H. Hardin_, Jan 26 2015