OFFSET
1,1
COMMENTS
Column 1 of A236979
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 13*a(n-1) +42*a(n-2) -1146*a(n-3) +730*a(n-4) +45238*a(n-5) -91716*a(n-6) -1057776*a(n-7) +3000135*a(n-8) +16310461*a(n-9) -56534174*a(n-10) -174338794*a(n-11) +713473424*a(n-12) +1315995560*a(n-13) -6415058232*a(n-14) -6942637052*a(n-15) +42386327376*a(n-16) +23999583512*a(n-17) -208999865648*a(n-18) -40204212816*a(n-19) +773126646240*a(n-20) -72301086496*a(n-21) -2138887142464*a(n-22) +691733245056*a(n-23) +4373056769152*a(n-24) -2270585247232*a(n-25) -6454028894208*a(n-26) +4519617474560*a(n-27) +6589427142656*a(n-28) -5880822898688*a(n-29) -4285047160832*a(n-30) +4950176727040*a(n-31) +1439725223936*a(n-32) -2525199532032*a(n-33) -30528110592*a(n-34) +670609440768*a(n-35) -107673026560*a(n-36) -62080942080*a(n-37) +13411287040*a(n-38) +629145600*a(n-39)
EXAMPLE
Some solutions for n=5
..1..2....1..2....1..2....0..3....2..0....0..3....1..1....1..0....2..3....2..3
..2..2....1..0....2..3....0..1....3..1....3..0....2..2....2..0....1..3....0..3
..1..2....2..0....3..2....1..3....3..1....2..3....2..1....1..0....3..2....3..3
..2..1....1..0....1..2....0..1....1..3....3..0....2..2....2..1....3..1....0..3
..2..2....0..2....2..0....2..2....0..2....1..3....1..2....1..0....0..2....2..3
..3..2....1..0....2..0....0..1....1..3....3..0....2..1....1..2....1..3....3..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 02 2014
STATUS
approved