OFFSET
1,1
COMMENTS
Row 2 of A263964.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 13*a(n-1) +6*a(n-2) -262*a(n-3) +488*a(n-4) -652*a(n-5) -7720*a(n-6) +52376*a(n-7) +108848*a(n-8) +259552*a(n-9) -852288*a(n-10) -6712576*a(n-11) +8309504*a(n-12) +21286400*a(n-13) -24625664*a(n-14) -121656320*a(n-15) -32204800*a(n-16) +612724736*a(n-17) -186105856*a(n-18) -728727552*a(n-19) +2890399744*a(n-20) -617873408*a(n-21) -6594756608*a(n-22) +4604821504*a(n-23) +3544186880*a(n-24) -9990832128*a(n-25) -8069840896*a(n-26) +6744440832*a(n-27) +4026531840*a(n-28) for n>30
EXAMPLE
Some solutions for n=4
..7..1..9..6..8....0..1..5..3..8....0..5..8..3..4....7..1..9..6..4
..2.12..0..4..3....2..6..4.14.13....1.13..7..2.12....2..0.11.12..3
.10.11..5.13.14...10.11.12..9..7...10.11..9..6.14...10..8..5.13.14
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 30 2015
STATUS
approved