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 A254543 #6 Jul 23 2025 14:47:31 %S A254543 4,50,135,670,1087,3383,6814,13843,20012,37643,50271,84258,124243, %T A254543 185263,233753,347471,423430,594001,776949,1021618,1205883,1612046, %U A254543 2004761,2549617,3112664,3856074,4411319,5541449,6253712,7547845,8918038 %N A254543 Number of length 5 1..(n+2) arrays with no leading partial sum equal to a prime. %C A254543 Row 5 of A254539 %H A254543 R. H. Hardin, <a href="/A254543/b254543.txt">Table of n, a(n) for n = 1..210</a> %e A254543 Some solutions for n=4 %e A254543 ..6....4....6....6....6....6....6....4....6....6....4....1....4....4....6....4 %e A254543 ..6....5....3....4....2....3....6....2....4....2....5....3....5....5....4....5 %e A254543 ..4....6....3....2....6....5....3....2....4....6....3....5....6....1....6....1 %e A254543 ..6....1....4....6....6....1....3....1....4....1....3....3....3....5....5....5 %e A254543 ..2....6....2....2....4....1....3....5....4....1....5....6....2....6....1....5 %K A254543 nonn %O A254543 1,1 %A A254543 _R. H. Hardin_, Feb 01 2015