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A199851 Number of -n..n arrays x(0..6) of 7 elements with zero sum and no element more than one greater than the previous 1
153, 575, 1393, 2958, 5754, 10426, 17879, 29268, 46126, 70322, 104253, 150764, 213380, 296204, 404213, 543086, 719592, 941366, 1217343, 1557506, 1973400, 2477778, 3085247, 3811830, 4675676, 5696580, 6896795, 8300422, 9934376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A199847

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) for n>24

EXAMPLE

Some solutions for n=6

..5....5....4....4....2....1....5....4....3....0....4....2....5....6....5....3

..4....6....3...-1....3....1....4....5....1....0....4....3....4....5....5....1

..0....2....3....0....1....2....4....3...-1....1...-2....4....4....3....4....1

..0....2...-1....0...-1....2....2...-3....0....2...-1....0....2....3...-5....1

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

.-3...-5...-5....0...-3...-1...-6...-1....0....0...-2...-5...-5...-6...-3...-3

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

CROSSREFS

Sequence in context: A246629 A325376 A256740 * A181775 A193249 A050209

Adjacent sequences:  A199848 A199849 A199850 * A199852 A199853 A199854

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 11 2011

STATUS

approved

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Last modified March 4 04:39 EST 2021. Contains 341779 sequences. (Running on oeis4.)