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A245162
Number of length n 0..7 arrays with new values introduced in order from both ends
1
1, 1, 2, 4, 9, 23, 65, 199, 654, 2296, 8569, 33825, 140581, 612933, 2795182, 13298464, 65852872, 338694406, 1805809431, 9963758843, 56805378239, 334156440067, 2025424520548, 12633195093794, 80976535864874, 532652296499548
OFFSET
1,3
COMMENTS
Column 7 of A245163
LINKS
FORMULA
Empirical: a(n) = 50*a(n-1) -1127*a(n-2) +15148*a(n-3) -135303*a(n-4) +846930*a(n-5) -3816041*a(n-6) +12508144*a(n-7) -29761816*a(n-8) +50647520*a(n-9) -59753232*a(n-10) +46142208*a(n-11) -20839680*a(n-12) +4147200*a(n-13) for n>14
EXAMPLE
Some solutions for n=7
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
..1....0....0....1....1....1....1....1....1....0....1....0....0....1....0....1
..0....0....1....1....0....1....2....2....1....1....1....1....0....0....0....1
..2....0....2....0....1....1....3....1....1....0....2....1....1....0....0....1
..0....1....1....1....1....0....2....1....1....0....1....1....1....1....0....0
..1....1....1....0....0....1....1....1....1....1....1....1....1....0....1....0
..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0
CROSSREFS
Sequence in context: A245159 A245160 A245161 * A007476 A202552 A272301
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 12 2014
STATUS
approved