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A198408 T(n,k) = Number of 2n X 2k 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor. 4
2, 17, 17, 377, 6986, 377, 11473, 5057327, 5057327, 11473, 375273, 3850206168, 85013617830, 3850206168, 375273, 12456897, 2970439193698, 1506130430723528, 1506130430723528, 2970439193698, 12456897, 414711897, 2302126761338667 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts:

........2............17..............377............11473...............375273

.......17..........6986..........5057327.......3850206168........2970439193698

......377.......5057327......85013617830.1506130430723528.27330079651426584414

....11473....3850206168.1506130430723528

...375273.2970439193698

.12456897

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..24

EXAMPLE

Some solutions for n=2, k=2:

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

..1..1..0..0....0..1..3..4....2..2..3..3....0..1..2..3....2..2..3..3

..2..3..3..4....4..0..3..4....3..1..1..2....1..3..0..4....1..3..2..2

..2..0..0..4....4..0..2..2....3..0..0..2....1..3..0..4....1..3..4..4

CROSSREFS

Sequence in context: A153652 A198290 A198596 * A198534 A032936 A263329

Adjacent sequences:  A198405 A198406 A198407 * A198409 A198410 A198411

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Oct 24 2011

STATUS

approved

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Last modified May 10 05:05 EDT 2021. Contains 343748 sequences. (Running on oeis4.)