login
A269883
Number of n X 3 0..5 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totaling five exactly once.
1
60, 11280, 943488, 68182800, 4546948272, 288987039048, 17784013336560, 1069390341717552, 63195307974649056, 3684171438042095496, 212456461177871728704, 12143038817293086139824, 688894552975843324538640
OFFSET
1,1
COMMENTS
Column 3 of A269888.
LINKS
FORMULA
Empirical: a(n) = 108*a(n-1) -3084*a(n-2) +8184*a(n-3) +42266*a(n-4) -148704*a(n-5) -74928*a(n-6) +597192*a(n-7) -527833*a(n-8) +90420*a(n-9) -4356*a(n-10) for n>11.
EXAMPLE
Some solutions for n=2
..3..2..2. .3..3..1. .2..2..3. .1..0..3. .4..5..2. .1..5..4. .5..5..5
..5..1..5. .5..0..1. .2..5..5. .5..3..4. .2..4..0. .1..5..1. .2..3..1
CROSSREFS
Cf. A269888.
Sequence in context: A001525 A309996 A146513 * A251991 A145411 A248708
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 06 2016
STATUS
approved