|
| |
|
|
A306124
|
|
Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero.
|
|
1
|
|
|
|
3, 7, 9, 19, 39, 73, 147, 319, 681, 1451, 3127, 6789, 14887, 32963, 73569, 165355, 374119, 851749, 1949959, 4486007, 10364533, 24034895, 55913671, 130430861, 304967127, 714466543, 1676614357, 3939963499, 9269602859, 21830156705
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,1
|
|
|
COMMENTS
|
Column 3 of A306129.
|
|
|
LINKS
|
R. H. Hardin, Table of n, a(n) for n = 1..210
|
|
|
FORMULA
|
Empirical: a(n) = 3*a(n-1) -a(n-3) -7*a(n-4) +4*a(n-5) -4*a(n-6) -7*a(n-8) +9*a(n-9) +14*a(n-10) +11*a(n-11) -7*a(n-12) -6*a(n-13)
|
|
|
EXAMPLE
|
Some solutions for n=5
..0..1..1. .0..0..0. .0..1..1. .0..0..0. .0..1..1. .0..1..1. .0..1..1
..0..0..1. .1..0..0. .1..1..1. .0..0..0. .1..1..1. .0..0..1. .1..1..1
..1..1..1. .1..0..1. .0..0..1. .0..0..1. .1..1..1. .0..0..0. .0..0..1
..0..1..1. .0..0..1. .0..1..1. .0..1..1. .1..1..1. .0..0..0. .1..1..1
..0..0..1. .0..0..0. .1..1..1. .1..1..1. .0..1..1. .0..0..0. .0..1..1
|
|
|
CROSSREFS
|
Cf. A306129.
Sequence in context: A224849 A304128 A304539 * A096102 A316157 A045797
Adjacent sequences: A306121 A306122 A306123 * A306125 A306126 A306127
|
|
|
KEYWORD
|
nonn
|
|
|
AUTHOR
|
R. H. Hardin, Jun 22 2018
|
|
|
STATUS
|
approved
|
| |
|
|
