A200449 Number of -3..3 arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences

26, 142, 728, 3788, 19802, 103726, 548204, 2916664, 15576706, 83481240, 448758338, 2418733790, 13066215896, 70726653732, 383520053994, 2082953525918, 11328873637896, 61694898371006, 336368349457684, 1835858710497508

Offset

1,1

Comments

Column 3 of A200454

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

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

Crossrefs

Sequence in context: A223418 A331458 A238917 * A248465 A014552 A192289

Adjacent sequences: A200446 A200447 A200448 * A200450 A200451 A200452

Keyword

nonn

Author

R. H. Hardin Nov 18 2011

Status

approved