A194617 - OEIS

A194617

Half the number of lower triangles of a 4X4 0..n array with no element equal to the average of its horizontal and vertical neighbors

47, 4322, 132214, 1674043, 12561823, 66369488, 279618492, 975189851, 2972844263, 8086809479, 20111108169, 46277171169, 100029289052, 204344500677, 398372414831, 744412292078, 1341415693780, 2338177034539, 3960008651919

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OFFSET

1,1

COMMENTS

Row 3 of A194615

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..50

EXAMPLE

Some solutions for n=2

..1........1........0........1........1........1........2........0

..0.1......0.2......2.2......2.0......2.2......2.2......0.2......2.0

..0.1.0....1.2.0....0.0.2....1.2.1....1.1.0....0.0.1....1.1.0....0.1.1

..0.2.2.0..2.0.0.1..1.0.0.2..0.0.2.1..1.2.0.2..1.0.0.1..1.0.0.1..2.0.2.1

CROSSREFS

Sequence in context: A123798 A104069 A334180 * A217229 A217230 A217231

Adjacent sequences: A194614 A194615 A194616 * A194618 A194619 A194620

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 30 2011

STATUS

approved