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A245159 Number of length n 0..4 arrays with new values introduced in order from both ends 1
1, 1, 2, 4, 9, 23, 65, 199, 654, 2296, 8568, 33794, 140039, 605869, 2718531, 12564289, 59419764, 285878342, 1392536354, 6842206084, 33819153429, 167827213315, 835048228437, 4162123757579, 20768689294634, 103709892420388 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 4 of A245163

LINKS

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

FORMULA

Empirical: a(n) = 17*a(n-1) -118*a(n-2) +434*a(n-3) -913*a(n-4) +1097*a(n-5) -696*a(n-6) +180*a(n-7) for n>8

EXAMPLE

Some solutions for n=7

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

..0....1....0....1....0....1....0....1....1....0....1....1....0....1....0....0

..0....0....1....1....1....0....1....0....1....1....2....2....1....2....0....1

..1....2....2....2....1....1....0....2....0....2....0....1....1....1....0....0

..1....2....1....2....2....0....2....0....0....1....0....1....0....0....1....0

..0....1....0....1....1....0....1....1....1....1....1....0....1....1....1....1

..0....0....0....0....0....0....0....0....0....0....0....0....0....0....0....0

CROSSREFS

Sequence in context: A164039 A014137 A245158 * A245160 A245161 A245162

Adjacent sequences:  A245156 A245157 A245158 * A245160 A245161 A245162

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 12 2014

STATUS

approved

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Last modified February 18 20:32 EST 2018. Contains 299330 sequences. (Running on oeis4.)