A202072 Number of arrays of n+2 integers in -4..4 with sum zero and the sum of every adjacent pair being odd

14, 120, 264, 0, 3752, 34632, 80812, 0, 1201220, 11395632, 27164010, 0, 412081530, 3962205256, 9551670652, 0, 146582674200, 1420696529280, 3448764292020, 0, 53320604716082, 519526871115120, 1267129662479106, 0, 19692671314474548

Offset

1,1

Comments

Column 4 of A202076

Links

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

Example

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

Crossrefs

Sequence in context: A268446 A221230 A240051 * A280003 A004312 A002056

Adjacent sequences: A202069 A202070 A202071 * A202073 A202074 A202075

Keyword

nonn

Author

R. H. Hardin Dec 10 2011

Status

approved