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 A254201 #5 Jul 23 2025 14:32:11 %S A254201 3,4,18,59,204,769,3098,14080,63868,261240,1030917,4350280,20376408, %T A254201 100217091,480075932,2180836235,9678232728,44364200452,215530397762, %U A254201 1076559054832,5260403805411,24406081179847 %N A254201 Number of length n 1..(5+2) arrays with no leading or trailing partial sum equal to a prime. %C A254201 Column 5 of A254204 %e A254201 Some solutions for n=4 %e A254201 ..1....6....4....1....1....4....4....4....6....6....1....1....4....6....1....6 %e A254201 ..5....4....4....5....3....2....5....2....2....6....5....7....6....2....7....4 %e A254201 ..6....4....2....4....5....3....3....6....6....4....3....2....6....4....7....5 %e A254201 ..4....6....6....6....1....1....6....6....6....4....1....6....6....4....1....1 %K A254201 nonn %O A254201 1,1 %A A254201 _R. H. Hardin_, Jan 26 2015