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A188240 Number of nondecreasing arrangements of 7 numbers in -(n+5)..(n+5) with sum zero and not more than two numbers equal 1
1082, 2395, 4818, 8964, 15696, 26123, 41748, 64370, 96346, 140463, 200176, 279520, 383424, 517461, 688344, 903624, 1172142, 1503785, 1910034, 2403502, 2998722, 3711609, 4560190, 5564140, 6745632, 8128589, 9739838, 11608268, 13765902 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A188236

LINKS

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

FORMULA

Empirical: a(n)=2*a(n-1)-a(n-3)-a(n-5)+a(n-6)-2*a(n-7)+2*a(n-8)+a(n-9)-a(n-13)-2*a(n-14)+2*a(n-15)-a(n-16)+a(n-17)+a(n-19)-2*a(n-21)+a(n-22)

EXAMPLE

Some solutions for n=4

.-6...-7...-9...-8...-7...-5...-8...-9...-4...-8...-6...-6...-6...-8...-9...-7

.-4...-5...-9...-6...-6...-5...-5...-8...-3...-7...-6...-5...-6...-8...-5...-7

.-2...-2....1...-3...-2...-1...-5...-8...-3...-3....0...-5...-3...-1...-1...-4

.-1....0....3...-1...-1...-1....0....3...-1...-1....0....1....1...-1....0...-1

..1....3....3....1...-1....1....5....6....2....6....1....2....1....4....2....6

..5....3....5....8....8....5....6....8....3....6....3....5....5....6....6....6

..7....8....6....9....9....6....7....8....6....7....8....8....8....8....7....7

CROSSREFS

Sequence in context: A220334 A221295 A220687 * A165809 A332069 A237804

Adjacent sequences:  A188237 A188238 A188239 * A188241 A188242 A188243

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2011

STATUS

approved

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Last modified August 10 08:49 EDT 2022. Contains 356039 sequences. (Running on oeis4.)