A230948 Number of (n+3)X(7+3) 0..3 white square subarrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 4, and upper left element zero

18208, 1144652, 91616256, 6209914254, 421312592376, 29418861515276, 2042677948725090, 141319541518782110, 9795693765467658856, 679240997122800513626, 47077272279587723130516, 3262751175546200573443768

Offset

1,1

Comments

Column 7 of A230949

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

Some solutions for n=2
..0..x..2..x..2..x..0..x..0..x....0..x..0..x..0..x..2..x..0..x
..x..1..x..3..x..2..x..1..x..3....x..1..x..1..x..2..x..3..x..1
..2..x..0..x..3..x..0..x..2..x....0..x..2..x..1..x..3..x..2..x
..x..3..x..0..x..2..x..1..x..3....x..3..x..1..x..0..x..2..x..1
..2..x..2..x..1..x..1..x..0..x....2..x..0..x..0..x..1..x..1..x

Crossrefs

Sequence in context: A205242 A172936 A025029 * A030331 A023340 A232142

Adjacent sequences: A230945 A230946 A230947 * A230949 A230950 A230951

Keyword

nonn

Author

R. H. Hardin, Nov 01 2013

Status

approved