OFFSET
1,1
COMMENTS
Column 5 of A275090.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 2*a(n-1) +15*a(n-2) +101*a(n-3) +450*a(n-4) +587*a(n-5) -948*a(n-6) -6010*a(n-7) -692*a(n-8) +18832*a(n-9) -31839*a(n-10) +1958*a(n-11) +58620*a(n-12) -170990*a(n-13) +243302*a(n-14) -278201*a(n-15) +182523*a(n-16) +57164*a(n-17) -121679*a(n-18) +9439*a(n-19) +37154*a(n-20) +841*a(n-21) -863*a(n-22) +182*a(n-23) +60*a(n-24) -6*a(n-25) -2*a(n-26) +a(n-27) for n>28
EXAMPLE
Some solutions for n=4
..0..0..1..1..0. .0..1..2..2..0. .0..1..1..0..2. .0..1..2..0..0
..0..1..1..2..0. .1..1..2..0..0. .1..1..2..0..0. .1..1..2..0..1
..1..1..2..2..0. .1..2..2..0..0. .1..2..2..0..1. .1..2..0..0..1
..0..2..2..0..1. .0..0..2..1..1. .1..2..0..0..1. .2..0..0..1..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 16 2016
STATUS
approved