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A222837 Number of nX7 0..3 arrays with no element equal to another at a city block distance of exactly two, and new values 0..3 introduced in row major order 1
163, 6144, 5832, 10584, 22848, 55296, 138240, 301056, 642048, 1382400, 3022848, 6690816, 14816256, 32741376, 72244224, 159258624, 351111168, 774297600, 1707764736, 3766818816, 8308300800, 18324658176, 40416165888, 89140107264 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A222838

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..64

FORMULA

Empirical: a(n) = 2*a(n-1) +a(n-3) -2*a(n-4) +4*a(n-5) +a(n-6) -a(n-9) for n>14

EXAMPLE

Some solutions for n=4

..0..1..2..2..3..1..2....0..1..1..2..0..0..1....0..1..1..2..3..1..2

..2..3..0..0..3..1..0....3..3..0..2..3..3..1....0..3..3..2..0..0..2

..2..3..1..1..2..2..3....1..2..0..1..1..2..0....1..2..0..1..1..3..3

..1..0..2..3..0..0..3....1..2..3..3..0..2..3....3..2..0..3..2..2..1

CROSSREFS

Sequence in context: A305723 A232260 A027543 * A134160 A219127 A270203

Adjacent sequences:  A222834 A222835 A222836 * A222838 A222839 A222840

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 06 2013

STATUS

approved

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Last modified October 27 19:59 EDT 2020. Contains 338036 sequences. (Running on oeis4.)