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A254949 revision #2

A254949

Number of length 2 1..(n+1) arrays with every leading partial sum divisible by 2, 3, 5, 7 or 11

2, 6, 12, 20, 30, 40, 52, 64, 76, 90, 105, 113, 132, 151, 172, 182, 208, 219, 247, 274, 303, 316, 350, 382, 417, 451, 490, 507, 551, 568, 611, 655, 701, 747, 797, 817, 868, 919, 974, 997, 1058, 1082, 1144, 1203, 1268, 1295, 1366, 1432, 1504, 1572, 1644, 1674, 1752

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 2 of A254947

LINKS

Table of n, a(n) for n=1..53.

EXAMPLE

Some solutions for n=4

..4....5....2....5....3....5....4....3....2....5....2....3....4....3....2....3

..5....1....4....3....2....2....4....1....5....5....2....3....3....4....3....5

CROSSREFS