A202070 Number of arrays of n+2 integers in -2..2 with sum zero and the sum of every adjacent pair being odd

4, 20, 26, 0, 96, 524, 726, 0, 2760, 15560, 22084, 0, 85120, 487564, 700966, 0, 2723256, 15746520, 22820940, 0, 89115840, 518517560, 755594620, 0, 2961237136, 17306539536, 25319793096, 0, 99494853120, 583417062540, 856125569286, 0

Offset

1,1

Comments

Column 2 of A202076

Links

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

Example

Some solutions for n=10
.-1....0....1....2....1...-2....1...-2...-2....2...-1...-2...-2...-1....1....1
..0...-1....0...-1....0....1....0....1...-1...-1....0....1....1...-2....2....2
..1....2...-1...-2...-1....0...-1...-2...-2....0...-1....0....0...-1....1...-1
..0....1....2...-1...-2....1....0...-1....1....1....2....1...-1....0....2...-2
.-1...-2....1....2...-1...-2....1...-2....2...-2...-1....2....0...-1...-1...-1
..0....1....0...-1....0....1...-2....1...-1....1....2...-1....1....2....0....2
..1....2...-1....2...-1....0...-1...-2....0....0....1...-2....2....1...-1....1
.-2...-1....0...-1....2....1....2....1...-1...-1...-2...-1....1...-2....2....0
..1....0...-1....2...-1....0...-1....2....0....2...-1...-2....0....1...-1....1
..0...-1...-2....1....2...-1...-2....1....1...-1....2....1...-1....2...-2....0
.-1...-2....1...-2...-1....0....1....2....2....0....1....2....0...-1...-1...-1
..2....1....0...-1....2....1....2....1....1...-1...-2....1...-1....2...-2...-2

Crossrefs

Sequence in context: A032425 A194045 A097251 * A198831 A323040 A259755

Adjacent sequences: A202067 A202068 A202069 * A202071 A202072 A202073

Keyword

nonn

Author

R. H. Hardin Dec 10 2011

Status

approved