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%I #4 Feb 01 2015 09:39:30
%S 4,20,105,576,3383,20393,121774,709169,4121638,24622476,150895459,
%T 928855881,5659650136,34105862488,205228295685,1249619101830,
%U 7761595614134,48955797807546,308737202532449,1916725035118260
%N Number of length n 1..(6+2) arrays with no leading partial sum equal to a prime
%C Column 6 of A254539
%H R. H. Hardin, <a href="/A254537/b254537.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=4
%e ..4....6....8....8....8....4....6....8....1....4....4....6....6....1....1....4
%e ..4....8....2....8....6....2....4....4....7....5....5....8....8....3....5....2
%e ..8....7....8....2....6....4....2....6....4....6....1....1....1....6....4....4
%e ..8....1....6....7....7....4....4....8....8....1....5....3....5....2....5....2
%K nonn
%O 1,1
%A _R. H. Hardin_, Feb 01 2015
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