%I #4 Jan 26 2015 20:47:09
%S 0,53,118,2197,3098,22189,50166,156454,222665,640886,845325,1995830,
%T 3234225,6187800,7811859,15035317,18326311,31910349,44572678,69639188,
%U 82473044,132683340,170881758,252397169,325215746,460488479,533632442
%N Number of length 7 1..(n+2) arrays with no leading or trailing partial sum equal to a prime
%C Row 7 of A254204
%H R. H. Hardin, <a href="/A254210/b254210.txt">Table of n, a(n) for n = 1..67</a>
%e Some solutions for n=4
%e ..6....4....4....6....6....4....4....6....6....6....6....6....4....4....6....4
%e ..4....4....5....4....2....2....4....6....4....2....6....2....6....2....2....2
%e ..2....6....3....6....4....3....6....6....4....2....2....2....6....6....2....2
%e ..4....4....4....4....4....3....6....6....6....2....6....4....5....2....4....1
%e ..4....2....2....4....5....6....4....6....6....2....6....6....1....6....6....1
%e ..6....4....6....4....3....6....2....6....6....4....4....4....2....4....5....4
%e ..4....4....6....4....6....6....4....6....6....4....6....4....6....4....1....4
%K nonn
%O 1,2
%A _R. H. Hardin_, Jan 26 2015