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A205047 Number of (n+1)X(n+1) 0..2 arrays with the number of rightwards and downwards edge increases in each 2X2 subblock equal to the number in all its horizontal and vertical neighbors 1
81, 889, 23720, 1887956, 431904792, 262607365879, 419073553408284, 1751784239909853212, 19173955137464358777368, 549459537636022165057004892, 41223026576427780605245919759896, 8096934932275470672919813293695999680 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205055

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..15

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A076749 A222995 A173810 * A086580 A206269 A236885

Adjacent sequences:  A205044 A205045 A205046 * A205048 A205049 A205050

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 21 2012

STATUS

approved

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Last modified December 6 09:33 EST 2021. Contains 349563 sequences. (Running on oeis4.)