A166773 Number of n X 7 1..2 arrays containing at least one of each value, and all equal values connected.

12, 182, 3518, 67756, 1284728, 24057962, 443968782, 8093169792, 146041169658, 2612337653032, 46368803939634, 817402784921660, 14321271894199646, 249540634207399516, 4326701163983868212, 74685900757658242314, 1284014777976657543342, 21994406111684553359456

Offset

1,1

Links

Andrew Howroyd, Table of n, a(n) for n = 1..200

Example

Some solutions for n=3
...2.2.2.2.2.2.1...2.2.2.1.1.1.1...2.2.2.2.2.2.2...2.2.2.2.2.2.2
...2.2.2.1.1.1.1...2.2.2.1.1.1.1...2.2.2.2.1.2.2...1.1.2.2.1.2.1
...2.2.1.1.1.1.1...2.2.1.1.1.1.1...2.2.1.1.1.2.2...1.1.1.1.1.1.1
------
...2.2.2.2.2.2.2...2.2.2.2.2.2.2...2.2.2.2.2.2.2...2.2.2.2.2.1.1
...2.2.1.2.1.1.2...2.1.1.2.2.2.2...2.1.1.1.1.2.2...1.2.1.1.1.1.1
...2.1.1.1.1.1.1...1.1.1.1.1.1.2...1.1.1.1.1.1.2...1.1.1.1.1.1.1

Crossrefs

Twice row 7 of A378932.

Sequence in context: A145560 A332960 A230345 * A202632 A285410 A218886

Adjacent sequences: A166770 A166771 A166772 * A166774 A166775 A166776

Keyword

nonn

Author

R. H. Hardin, Oct 21 2009

Extensions

a(6) onwards from Andrew Howroyd, Dec 12 2024

Status

approved