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 A254538 #6 Jul 23 2025 14:46:57 %S A254538 5,28,163,1026,6814,45472,297210,1936867,12941917,88456127,605472534, %T A254538 4098451778,27532173631,186053199184,1280442885415,8972454019845, %U A254538 63101697125668,438054873198566,2987530815338138,20248691923570271 %N A254538 Number of length n 1..(7+2) arrays with no leading partial sum equal to a prime. %C A254538 Column 7 of A254539 %H A254538 R. H. Hardin, <a href="/A254538/b254538.txt">Table of n, a(n) for n = 1..210</a> %e A254538 Some solutions for n=4 %e A254538 ..8....1....9....6....4....1....4....4....6....4....9....4....8....1....4....9 %e A254538 ..7....8....9....6....6....7....4....4....9....6....3....5....8....8....5....7 %e A254538 ..6....7....9....2....6....1....1....6....1....2....3....1....8....3....6....4 %e A254538 ..5....2....3....8....6....7....3....7....8....6....6....8....9....4....6....6 %K A254538 nonn %O A254538 1,1 %A A254538 _R. H. Hardin_, Feb 01 2015