

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
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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(n1) 118*a(n2) +434*a(n3) 913*a(n4) +1097*a(n5) 696*a(n6) +180*a(n7) 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



