A208463 Number of nX4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to more than two of its immediate leftward or upward or right-upward antidiagonal neighbors

15, 4041, 4132120, 10318694804, 51074630353994, 441285917587055633, 6105599904286957450405, 127076755601333057601660992, 3793882208792084308313815728802, 156506565477239116898837571013067198

Offset

1,1

Comments

Column 4 of A208466

Links

R. H. Hardin, Table of n, a(n) for n = 1..47

Example

Some solutions for n=4
..0..0..0..0....0..0..0..1....0..0..1..0....0..0..0..0....0..0..0..0
..0..1..0..0....0..1..0..0....0..0..0..0....1..0..1..1....1..0..1..1
..0..0..1..0....0..0..1..0....0..1..0..2....0..1..2..0....0..2..0..0
..1..0..0..0....0..1..0..1....1..0..0..0....0..0..0..0....0..0..1..0

Crossrefs

Sequence in context: A262019 A153832 A198524 * A374796 A374335 A172322

Adjacent sequences: A208460 A208461 A208462 * A208464 A208465 A208466

Keyword

nonn

Author

R. H. Hardin Feb 27 2012

Status

approved