A265213 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A265213

Number of (2n-1)X2 0..4n-3 arrays with upper left zero and lower right 4n-3 and each element differing from its horizontal and vertical neighbors by a power of three.

1, 16, 1958, 654833, 112227310, 32488774453, 7717657825137, 4728240318574186, 2979856311196634505, 2024001459953859821039, 1213770752826839089178744, 689849091376425076726628410, 380422604546957185646459036805

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 2 of A265218 (nonzero terms).

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..105

EXAMPLE

Some solutions for n=3

..0..1....0..1....0..9....0..3....0..3....0..1....0..9....0..9....0..3....0..9

..1..2....1..0....3..6....1..4....9..0....1..2....3..6....3..6....3..0....9..0

..0..3....0..9....0..9....0..1....0..3....2..3....6..9....6..3....4..3....6..3