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A250316 Number of length n+2 0..4 arrays with the sum of second differences squared multiplied by some arrangement of +-1 equal to zero 0
13, 117, 233, 1773, 8767, 57833, 363457, 2317841, 14305925, 85334033, 487200669, 2669191565, 14140938607 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A250320

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=6

..4....3....2....2....2....3....4....2....2....3....1....3....3....3....3....3

..0....1....3....2....3....2....0....0....0....1....3....2....4....0....2....4

..1....0....0....4....4....0....0....3....3....3....4....1....1....0....0....0

..4....3....0....2....3....4....3....2....1....4....3....1....0....1....4....1

..2....4....3....3....4....3....3....2....1....2....3....3....1....1....3....0

..4....4....2....4....3....1....4....4....4....3....4....3....1....3....0....4

..0....2....2....0....2....3....4....4....4....4....2....0....4....2....1....3

..0....4....1....2....3....0....4....4....2....4....4....1....3....3....2....4

CROSSREFS

Sequence in context: A296332 A021034 A296632 * A250557 A022737 A016295

Adjacent sequences:  A250313 A250314 A250315 * A250317 A250318 A250319

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 18 2014

STATUS

approved

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Last modified September 19 18:36 EDT 2021. Contains 347564 sequences. (Running on oeis4.)