A164762 Number of nX5 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value.

96, 3096, 45892, 492920, 4434848, 35416836, 259865428, 1789636604, 11730206308

Offset

2,1

Links

Table of n, a(n) for n=2..10.

Example

Some solutions for n=3
...1.1.1.1.2...1.2.2.2.2...1.1.1.1.2...1.2.2.2.2...1.1.1.2.2...1.1.1.3.2
...3.3.1.1.4...1.4.2.2.2...1.3.3.3.3...1.3.4.2.2...3.3.2.2.4...3.3.3.3.3
...3.3.4.4.4...3.4.4.4.4...3.3.4.4.4...3.3.4.4.4...3.4.4.4.4...3.3.3.4.4
------
...1.1.1.3.2...1.1.1.1.2...1.1.1.2.2...1.1.1.4.2...1.2.2.2.2...1.1.2.2.2
...1.3.3.3.4...1.3.3.3.3...1.3.1.2.2...4.4.1.4.2...1.1.1.2.4...1.1.2.2.4
...3.3.3.3.4...3.3.3.4.4...3.3.1.2.4...3.4.4.4.4...3.3.1.1.4...3.2.2.4.4

Crossrefs

Sequence in context: A105254 A234075 A347753 * A282210 A008660 A164751

Adjacent sequences: A164759 A164760 A164761 * A164763 A164764 A164765

Keyword

nonn

Author

R. H. Hardin, Aug 24 2009

Status

approved