A202073 Number of arrays of n+2 integers in -5..5 with sum zero and the sum of every adjacent pair being odd.

24, 220, 504, 0, 15010, 142692, 340660, 0, 10924220, 105606040, 255768620, 0, 8472842700, 82602700388, 201570991218, 0, 6800283132780, 66634056364880, 163360889824230, 0, 5575911122723700, 54822111009651480, 134826580792851780

Offset

1,1

Comments

Column 5 of A202076.

Links

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

Example

Some solutions for n=3
..2....2...-4....2....0....4...-2....2...-4....2....4...-2....2....4...-2....4
.-1....5....5....5....3...-3...-3...-3....5....3...-1...-3...-3...-1...-1....3
.-4...-2....2....0....4....2....0....4....0...-2...-4....4....4...-2....4....0
.-1...-1....1...-3...-5...-3....3...-5....3...-1....5....3...-1...-1...-1...-3
..4...-4...-4...-4...-2....0....2....2...-4...-2...-4...-2...-2....0....0...-4

Crossrefs

Cf. A202076.

Sequence in context: A138406 A042112 A297679 * A107968 A269777 A024302

Adjacent sequences: A202070 A202071 A202072 * A202074 A202075 A202076

Keyword

nonn

Author

R. H. Hardin, Dec 10 2011

Status

approved