A069439 - 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

A069439

Half the number of 13 X n binary arrays with no path of adjacent 1's or adjacent 0's from top row to bottom row.

4095, 33440190, 271523097884, 2192221953687972

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

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

CROSSREFS

Cf. 2 X n A000079, n X 1 A000225, vertical path of 1 A069361-A069395, vertical paths of 0+1 A069396-A069416, vertical path of 1 not 0 A069417-A069428, no vertical paths A069429-A069447, no horizontal or vertical paths A069448-A069452.

Sequence in context: A069387 A359085 A069413 * A212935 A076154 A182685

Adjacent sequences: A069436 A069437 A069438 * A069440 A069441 A069442

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 22 2002

STATUS

approved