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A245137
Number of length 7 0..n arrays least squares fitting to a zero slope straight line, with a single point taken as having zero slope
1
20, 195, 1064, 4005, 11856, 29813, 66256, 134091, 252060, 446193, 751536, 1214369, 1893612, 2863755, 4217056, 6065957, 8545968, 11819349, 16076760, 21542115, 28475524, 37176625, 47988672, 61303825, 77564708, 97271523, 120985592
OFFSET
1,1
COMMENTS
Row 7 of A245134
LINKS
FORMULA
Empirical: a(n) = a(n-1) +3*a(n-2) -6*a(n-4) -6*a(n-5) +7*a(n-6) +11*a(n-7) -11*a(n-9) -7*a(n-10) +6*a(n-11) +6*a(n-12) -3*a(n-14) -a(n-15) +a(n-16)
EXAMPLE
Some solutions for n=8
..4....6....4....0....5....5....4....1....6....5....6....5....3....5....1....3
..2....1....5....7....3....8....3....2....0....1....2....6....7....4....7....7
..1....8....1....6....8....8....7....3....2....6....2....7....0....7....4....1
..6....0....0....3....0....7....5....1....2....7....2....8....1....1....6....1
..5....2....5....2....7....5....0....5....1....7....7....6....8....5....2....6
..0....7....0....6....2....8....2....1....8....5....7....2....0....2....2....0
..4....4....6....2....6....6....7....1....1....2....1....8....5....7....5....6
CROSSREFS
Sequence in context: A247742 A355590 A219369 * A232224 A338778 A375803
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jul 12 2014
STATUS
approved