A254532 Number of length n 1..(1+2) arrays with no leading partial sum equal to a prime.

1, 1, 1, 2, 4, 6, 11, 20, 33, 62, 135, 317, 692, 1345, 2651, 5741, 12576, 25825, 49270, 90118, 168115, 340003, 751400, 1741713, 4057301, 9232683, 20184851, 42473752, 87925348, 183030469, 382853596, 790870128, 1597901060, 3189861839, 6430641490

Offset: 1

Author

R. H. Hardin, Feb 01 2015

Keywords

• nonn

Comments

Column 1 of A254539

Examples

			All solutions for n=4
..1....1
..3....3
..2....2
..2....3
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210