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A254829
Number of length 2 1..(n+1) arrays with every leading partial sum divisible by 2, 3 or 5.
1
2, 6, 10, 16, 23, 26, 35, 44, 55, 60, 75, 81, 98, 115, 135, 143, 168, 177, 204, 229, 257, 268, 301, 329, 362, 392, 427, 441, 484, 498, 539, 579, 622, 664, 713, 730, 778, 823, 874, 893, 950, 970, 1026, 1079, 1138, 1160, 1227, 1250, 1317, 1378, 1445, 1470, 1545, 1609
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = a(n-1) + 2*a(n-30) - 2*a(n-31) - a(n-60) + a(n-61).
EXAMPLE
All solutions for n=4:
..2....2....5....5....4....5....2....4....3....3....4....3....3....4....5....2
..4....2....4....3....5....5....1....4....2....3....2....5....1....1....1....3
CROSSREFS
Row 2 of A254827.
Sequence in context: A294013 A183575 A096184 * A030511 A351635 A071597
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 08 2015
STATUS
approved