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 A255719 #6 Jul 23 2025 15:10:50 %S A255719 1,6,21,81,120,342,653,1221,1729,3037,3884,6136,8650,12056,14580, %T A255719 20505,24083,32191,40684,51184,58455,74807,90133,110175,130476,155925, %U A255719 173529,209720,230413,269673,310187,358492,408861,473591,512204,582744,654517 %N A255719 Number of length 4 1..(n+2) arrays with no leading partial sum equal to a prime and no consecutive values equal. %C A255719 Row 4 of A255716 %H A255719 R. H. Hardin, <a href="/A255719/b255719.txt">Table of n, a(n) for n = 1..210</a> %e A255719 Some solutions for n=4 %e A255719 ..6....6....4....6....1....4....6....4....4....6....1....6....6....6....4....6 %e A255719 ..3....2....2....4....5....6....2....2....5....4....3....2....2....2....2....2 %e A255719 ..5....1....3....5....6....4....4....6....3....6....2....6....6....1....4....4 %e A255719 ..2....5....1....1....2....6....6....2....6....4....3....1....4....6....5....2 %Y A255719 Cf. A255716 %K A255719 nonn %O A255719 1,2 %A A255719 _R. H. Hardin_, Mar 03 2015