A166774 Number of n X 8 1..2 arrays containing at least one of each value, and all equal values connected.

14, 240, 7432, 241542, 7855758, 253872596, 8093169792, 255122769986, 7970906327712, 247157616043778, 7612389643759656, 233047562889531042, 7095832481400967212, 214993871402051336458, 6485057217704886418618, 194824321266936718091888, 5831359188043905108147376, 173952785425039482256265510

Offset

1,1

Links

Andrew Howroyd, Table of n, a(n) for n = 1..100

Example

Some solutions for n=3
...2.2.2.2.2.2.2.2...2.1.1.1.1.1.1.1...2.1.1.1.1.1.1.2...2.2.2.2.2.2.2.1
...1.1.1.2.2.2.2.1...2.1.2.1.1.1.1.1...2.2.1.1.1.1.1.2...2.1.1.1.1.1.1.1
...1.1.1.1.1.1.1.1...2.2.2.2.2.2.2.2...2.2.2.2.2.2.2.2...2.2.2.2.1.1.1.1
------
...1.1.1.1.1.1.1.1...2.2.2.2.1.1.1.1...1.1.1.2.2.2.2.2...2.2.1.1.1.1.1.1
...1.1.1.1.2.1.1.1...2.2.1.1.1.1.1.1...1.2.2.2.2.2.2.2...2.2.2.2.2.2.1.1
...1.1.1.1.2.2.2.1...1.1.1.1.1.1.1.1...1.1.1.1.1.1.2.2...2.2.1.1.1.1.1.1

Crossrefs

Twice row 8 of A378932.

Sequence in context: A222377 A220502 A256462 * A286882 A326651 A055477

Adjacent sequences: A166771 A166772 A166773 * A166775 A166776 A166777

Keyword

nonn,changed

Author

R. H. Hardin, Oct 21 2009

Extensions

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

Status

approved