OFFSET
1,1
COMMENTS
Row 4 of A223692
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 25*a(n-1) +166*a(n-2) -4762*a(n-3) -15242*a(n-4) +261578*a(n-5) +557344*a(n-6) -5966572*a(n-7) -10691953*a(n-8) +66155465*a(n-9) +113681634*a(n-10) -380763790*a(n-11) -672252588*a(n-12) +1143346268*a(n-13) +2171718000*a(n-14) -1723023332*a(n-15) -3753952336*a(n-16) +1173055984*a(n-17) +3382164960*a(n-18) -244043008*a(n-19) -1495422976*a(n-20) -17107712*a(n-21) +299094528*a(n-22) +3904512*a(n-23) -19066880*a(n-24) for n>27
EXAMPLE
Some solutions for n=3
.12.10.12...12.10.12...12.14.12....0..8.10....8.14..8....0..8..0....8.14..8
.12.10..2....2.10..8....6.14..6...14..8..0....8.14..8....0..7..6....8.14..6
..2..3..2...12.10..8....6..5..6...14..8.10....8..0..1....6.14.12....6..7.15
.11..3.11....8.10..8....6..5..4...10.12.10....8..0..7....8.10.12....6..7..6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 25 2013
STATUS
approved