A254537 - OEIS

%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