A201878 - OEIS

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A201878

Number of zero-sum -n..n arrays of 7 elements with first and second differences also in -n..n

21, 345, 2509, 11107, 36569, 99143, 232969, 492307, 958025, 1743993, 3006947, 4955757, 7859017, 12059931, 17987847, 26166137, 37233755, 51958111, 71242519, 96156041, 127946965, 168048881, 218120357, 280058879, 356003167, 448386363

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Row 7 of A201873

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..142

EXAMPLE

Some solutions for n=6

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

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

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