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A251060
Number of (n+1)X(3+1) 0..2 arrays with no 2X2 subblock having x11-x00 less than x10-x01
1
867, 17129, 320950, 6182747, 119032248, 2295692500, 44280784440, 854262466837, 16480691222664, 317958213164772, 6134299936443854, 118348278776443364, 2283277183839898530, 44051001079322901638, 849870585415520935170
OFFSET
1,1
COMMENTS
Column 3 of A251065
LINKS
FORMULA
Empirical: a(n) = 20*a(n-1) +149*a(n-2) -3483*a(n-3) -1646*a(n-4) +181002*a(n-5) -200603*a(n-6) -4389443*a(n-7) +7563091*a(n-8) +57780280*a(n-9) -117969316*a(n-10) -443230440*a(n-11) +1006122140*a(n-12) +2058747657*a(n-13) -5162805928*a(n-14) -5921804997*a(n-15) +16838704214*a(n-16) +10500869967*a(n-17) -36121221195*a(n-18) -10740080874*a(n-19) +51975978543*a(n-20) +4392901894*a(n-21) -50615684360*a(n-22) +2927992450*a(n-23) +33382009991*a(n-24) -5129616183*a(n-25) -14828202384*a(n-26) +3221326394*a(n-27) +4390111165*a(n-28) -1132749541*a(n-29) -851993343*a(n-30) +240896502*a(n-31) +105264572*a(n-32) -31183216*a(n-33) -7839280*a(n-34) +2367008*a(n-35) +314880*a(n-36) -95232*a(n-37) -5120*a(n-38) +1536*a(n-39)
EXAMPLE
Some solutions for n=2
..0..0..0..1....0..2..1..1....0..1..1..2....0..1..0..1....0..0..1..0
..0..1..2..1....2..1..2..2....0..0..2..2....0..0..2..1....0..0..0..1
..1..1..1..2....0..2..1..1....1..1..0..0....1..2..0..1....0..1..2..1
CROSSREFS
Sequence in context: A063900 A348818 A250522 * A205224 A165385 A165377
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 29 2014
STATUS
approved