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 A254535 #6 Jul 23 2025 14:46:36 %S A254535 3,10,40,160,670,3001,13503,60408,270370,1192385,5221700,23404787, %T A254535 108379668,507618711,2353392292,10735523052,48337299889,216062343583, %U A254535 966793284879,4375808357962,20209591137998,95483805098650 %N A254535 Number of length n 1..(4+2) arrays with no leading partial sum equal to a prime. %C A254535 Column 4 of A254539 %H A254535 R. H. Hardin, <a href="/A254535/b254535.txt">Table of n, a(n) for n = 1..210</a> %e A254535 Some solutions for n=4 %e A254535 ..4....6....4....1....1....6....4....6....4....1....4....1....1....6....6....4 %e A254535 ..2....3....2....5....5....6....6....3....2....5....6....3....3....6....2....5 %e A254535 ..2....5....3....3....2....3....5....5....3....2....2....4....6....6....4....6 %e A254535 ..4....4....1....3....1....5....5....1....3....4....2....2....6....2....6....6 %K A254535 nonn %O A254535 1,1 %A A254535 _R. H. Hardin_, Feb 01 2015