OFFSET
1,1
COMMENTS
Column 4 of A223933
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/106748928000)*n^16 + (1/13343616000)*n^15 + (1/116756640)*n^14 + (4003/37362124800)*n^13 + (97199/28740096000)*n^12 + (670871/14370048000)*n^11 + (94057/130636800)*n^10 - (113957/261273600)*n^9 + (565001317/5225472000)*n^8 - (887457691/1306368000)*n^7 + (3190047029/359251200)*n^6 - (36838723231/718502400)*n^5 + (4745796217531/15567552000)*n^4 - (170787179737/162162000)*n^3 + (51300697729/21621600)*n^2 - (74839579/180180)*n - 7017 for n>6
EXAMPLE
Some solutions for n=3
..2..2..0..0....1..2..0..0....0..2..2..2....0..1..1..0....1..2..1..0
..0..2..2..1....1..2..2..2....0..0..2..2....0..0..2..1....1..1..2..1
..0..0..2..2....1..2..2..2....0..0..0..2....0..0..0..2....0..1..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 29 2013
STATUS
approved