OFFSET
1,1
COMMENTS
Column 6 of A224204
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 84*a(n-1) -2771*a(n-2) +49004*a(n-3) -526214*a(n-4) +3641009*a(n-5) -16632719*a(n-6) +48536326*a(n-7) -53423733*a(n-8) -313959977*a(n-9) +1729942603*a(n-10) -7086418537*a(n-11) +13780962535*a(n-12) +5231265096*a(n-13) -20279410782*a(n-14) +609579098232*a(n-15) +294855159788*a(n-16) +2331852968592*a(n-17) +7276333185488*a(n-18) +4826951354776*a(n-19) +18771064269632*a(n-20) +25683656373760*a(n-21) +16941876341184*a(n-22) +25615354625280*a(n-23) +22113238049280*a(n-24) +5504163840000*a(n-25) for n>32
EXAMPLE
Some solutions for n=3
..0..0..0..0..1..0....0..0..0..0..1..0....0..0..0..0..2..0....0..0..0..0..0..0
..0..0..0..1..1..0....0..0..0..2..0..0....0..0..0..2..1..1....0..0..0..2..2..1
..2..2..2..2..3..3....0..0..3..2..2..0....2..2..2..3..2..2....0..0..3..3..3..1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Apr 01 2013
STATUS
approved