A165383 Number of slanted nX6 (i=1..n)X(j=i..6+i-1) 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

241, 5472, 37784, 174197, 598332, 1700146, 4185118, 9267244, 18840617, 35800784, 64279915, 110110272, 181122449, 287758922, 443428845, 665278308, 974595065, 1397742124

Offset

2,1

Links

Table of n, a(n) for n=2..19.

Example

One solution for n=16
...1.1.2.2.2.2..............................
.....1.1.2.2.2.2............................
.......1.1.1.1.2.2..........................
.........1.1.2.2.2.2........................
...........1.1.1.1.2.2......................
.............1.2.1.1.2.2....................
...............2.2.2.2.3.3..................
.................2.2.2.2.3.3................
...................3.3.2.3.3.3..............
.....................3.3.3.4.4.4............
.......................3.3.4.4.4.4..........
.........................3.3.3.3.4.4........
...........................3.3.4.4.4.4......
.............................3.3.3.3.4.4....
...............................3.3.4.4.4.4..
.................................3.3.3.3.4.4

Crossrefs

Sequence in context: A119596 A046948 A220056 * A006687 A060893 A165375

Adjacent sequences: A165380 A165381 A165382 * A165384 A165385 A165386

Keyword

nonn

Author

R. H. Hardin Sep 17 2009

Status

approved