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A239995
Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4
1
3, 13, 61, 256, 1117, 5012, 22592, 102336, 465662, 2123857, 9698188, 44317651, 202610817, 926532786, 4237612923, 19382872561, 88661747469, 405570672096, 1855255219753, 8486814865920, 38822908166872, 177595801954595
OFFSET
1,1
COMMENTS
Column 2 of A240000
LINKS
FORMULA
Empirical: a(n) = 8*a(n-1) -20*a(n-2) +34*a(n-3) -84*a(n-4) +92*a(n-5) -68*a(n-6) +222*a(n-7) +13*a(n-8) -251*a(n-9) +25*a(n-10) -495*a(n-11) +485*a(n-12) -44*a(n-13) -180*a(n-14) +554*a(n-15) -648*a(n-16) +14*a(n-17) +152*a(n-18) -190*a(n-19) -140*a(n-20) +397*a(n-21) -273*a(n-22) +75*a(n-23) +167*a(n-24) -136*a(n-25) +27*a(n-26)
EXAMPLE
Some solutions for n=5
..3..3....0..3....0..3....3..3....3..3....3..3....3..3....0..0....0..3....3..3
..0..3....3..2....0..0....0..2....0..3....0..3....0..3....3..3....0..2....0..3
..0..3....2..1....3..3....0..0....2..2....0..3....3..2....3..3....3..2....3..3
..2..2....2..1....0..2....3..2....2..1....3..2....3..1....2..2....2..2....2..1
..2..0....2..0....2..0....3..2....2..0....3..3....2..1....3..1....0..0....3..1
CROSSREFS
Sequence in context: A112568 A104089 A334150 * A319924 A108143 A101368
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 30 2014
STATUS
approved