A254534 - OEIS

%I #4 Feb 01 2015 09:36:09

%S 2,5,15,45,135,421,1466,5403,19417,69205,249569,883285,3024282,

%T 10359274,37010151,138333876,524680726,1964881580,7214899381,

%U 26104002605,93449335588,331875353107,1177784053061,4229817098432,15554800422055

%N Number of length n 1..(3+2) arrays with no leading partial sum equal to a prime

%C Column 3 of A254539

%H R. H. Hardin, <a href="/A254534/b254534.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=4

%e ..1....4....4....4....4....1....4....1....4....4....1....1....1....4....1....4

%e ..3....5....4....5....2....3....4....3....2....5....5....5....3....5....5....5

%e ..5....3....4....5....2....4....2....2....2....1....4....2....2....3....3....3

%e ..3....2....3....2....1....4....2....4....2....2....5....4....2....4....3....3

%K nonn

%O 1,1

%A _R. H. Hardin_, Feb 01 2015