A166793 Number of nX7 1..2 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.

12, 97, 1272, 13357, 103702

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for n=3
...2.2.1.1.1.1.2...1.1.1.1.1.1.2...1.1.1.1.1.2.2...1.1.1.2.2.2.2
...2.2.1.1.1.1.2...1.2.1.1.2.1.2...2.1.1.1.1.2.2...2.1.2.2.2.2.2
...2.2.2.2.2.2.2...1.2.2.2.2.2.2...2.2.2.2.2.2.2...2.2.2.2.2.2.2
------
...1.1.1.1.1.1.1...1.1.1.1.1.1.1...2.1.1.2.2.2.2...1.1.1.1.1.1.1
...1.1.1.1.1.2.1...1.1.1.1.1.1.1...2.2.1.2.2.2.2...2.1.2.2.1.1.1
...1.1.2.2.2.2.2...2.2.2.1.1.1.1...2.2.2.2.2.2.2...2.2.2.2.2.2.2

Crossrefs

Sequence in context: A021029 A270496 A128594 * A041268 A216028 A238755

Adjacent sequences: A166790 A166791 A166792 * A166794 A166795 A166796

Keyword

nonn

Author

R. H. Hardin Oct 21 2009

Status

approved