A202667 Number of -n..n arrays of 7 elements with first through fourth differences also in -n..n

23, 613, 6055, 34171, 136999, 438177, 1186107, 2839237, 6169921, 12410957, 23428771, 41960815, 71850731, 118414399, 188766767, 292290383, 441086445, 650648037, 940297237, 1334163773, 1861743181, 2558935713, 3468879881

Offset

1,1

Comments

Row 7 of A202664

Links

R. H. Hardin, Table of n, a(n) for n = 1..69

Example

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

Crossrefs

Sequence in context: A362482 A294995 A142750 * A129991 A265681 A023295

Adjacent sequences: A202664 A202665 A202666 * A202668 A202669 A202670

Keyword

nonn

Author

R. H. Hardin Dec 22 2011

Status

approved