A202515 Number of zero-sum -n..n arrays of 7 elements with first through third differences also in -n..n

7, 109, 747, 3285, 10799, 29295, 68781, 145389, 282771, 514931, 887733, 1463059, 2320007, 3560523, 5310021, 7724815, 10991973, 15338839, 21031377, 28387187, 37770899, 49610615, 64391723, 82677087, 105095693, 132370313, 165301879

Offset

1,1

Comments

Row 7 of A202511

Links

R. H. Hardin, Table of n, a(n) for n = 1..70

Example

Some solutions for n=7
..7....4...-2...-2...-4...-7...-2...-2....6...-3....5....2...-2....4...-4...-1
..0....1....3...-5...-1...-2....1...-2....4...-5....4....7...-3...-1....3....2
.-5....0....1...-3...-1...-2....5...-4....0...-6....1....6...-4....0....6....3
.-7...-2...-3....2...-2....0....5...-5....0...-1...-3....1...-2....2....3...-1
.-3...-3...-3....3....2....3....0....0....0....5...-3...-2....1....0...-2...-3
..1...-1....1....4....4....6...-3....6...-4....6...-1...-7....5...-1...-2...-1
..7....1....3....1....2....2...-6....7...-6....4...-3...-7....5...-4...-4....1

Crossrefs

Sequence in context: A137648 A106977 A142480 * A096498 A123804 A333092

Adjacent sequences: A202512 A202513 A202514 * A202516 A202517 A202518

Keyword

nonn

Author

R. H. Hardin Dec 20 2011

Status

approved