A250314 - OEIS

A250314

Number of length n+2 0..2 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero

5, 25, 41, 161, 487, 1689, 5849, 19981, 67459, 221953, 709677, 2225181, 6874957, 21019457, 63845081, 193077349, 582247055, 1752693185, 5269930487, 15833493125, 47548549519, 142743601321, 428431672069, 1285708580949, 3857979555851

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 2 of A250320

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..29

EXAMPLE

Some solutions for n=6

..2....1....1....2....0....1....0....2....1....1....1....0....0....0....1....1

..2....0....0....2....1....0....2....1....1....0....1....1....0....2....0....1

..1....0....0....0....1....0....2....1....1....0....2....0....1....1....0....1

..0....0....0....1....2....1....1....2....1....1....2....2....1....1....0....1

..1....0....2....1....1....0....0....1....1....2....1....0....2....2....0....2

..2....1....0....2....1....2....1....1....1....2....0....0....2....1....0....0

..2....1....1....0....1....2....1....1....0....2....1....0....0....2....1....0

..0....0....0....2....0....1....1....2....0....1....1....1....0....2....2....2

CROSSREFS

Sequence in context: A099799 A093534 A070388 * A293571 A294256 A056872

Adjacent sequences: A250311 A250312 A250313 * A250315 A250316 A250317

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 18 2014

STATUS

approved