A220580 Equals one maps: number of 2Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and antidiagonal neighbors in a random 0..1 2Xn array

1, 8, 21, 115, 371, 1504, 5240, 19904, 71787, 266591, 973703, 3590009, 13161398, 48409054, 177699822, 653013280, 2398088376, 8809799868, 32356803616, 118855121770, 436550962678, 1603501078153, 5889674104016, 21633105877502

Offset

1,2

Comments

Row 2 of A220579

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Sequence in context: A054855 A220611 A297340 * A100903 A358720 A240648

Adjacent sequences: A220577 A220578 A220579 * A220581 A220582 A220583

Keyword

nonn

Author

R. H. Hardin Dec 16 2012

Status

approved