A188007 Number of nondecreasing arrangements of 7 numbers x(i) in -(n+5)..(n+5) with the sum of sign(x(i))*x(i)^2 zero.

376, 644, 1055, 1696, 2596, 3796, 5443, 7674, 10392, 14198, 18641, 24416, 31116, 39648, 49989, 62572, 76306, 93562, 113133, 138192, 164244, 195934, 230445, 272084, 318416, 371618, 428815, 496774, 567422, 655234, 745671, 851342, 959446, 1088018

Offset

1,1

Comments

Row 7 of A188002.

Links

R. H. Hardin, Table of n, a(n) for n = 1..37

Example

Some solutions for n=3
.-5...-7...-4...-6...-5...-3...-3...-5...-7...-6...-7...-7...-5...-7...-7...-7
.-1...-3...-4...-6...-3...-3...-2...-4...-6...-4...-3...-6...-5...-4...-3...-6
..0...-3...-2...-2....0...-3...-2...-2....1...-2....2...-4...-4...-4....0...-5
..0....1....0....1....0....1....0....2....1...-1....2...-4...-2...-3....0...-2
..0....1....0....1....3....1....0....3....3....2....3....2....3....1....0....1
..1....4....0....5....3....3....1....4....5....2....4....7....5....5....3....7
..5....7....6....7....4....4....4....4....7....7....5....8....6....8....7....8

Crossrefs

Cf. A188002.

Sequence in context: A259769 A238231 A008853 * A251644 A234916 A288916

Adjacent sequences: A188004 A188005 A188006 * A188008 A188009 A188010

Keyword

nonn

Author

R. H. Hardin, Mar 18 2011

Status

approved