A253127 Number of length n+2 0..6 arrays with the sum of medians of adjacent triples multiplied by some arrangement of +-1 equal to zero.

19, 1197, 2452, 46945, 246003, 2521335, 16987236, 134079743, 932611547, 6789960255, 47460044577, 336719190243, 2355817261111, 16570926140871, 115971713357683, 813294142451421, 5692584117442169, 39876957472466661

Offset

1,1

Comments

Column 6 of A253129.

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Cf. A253129.

Sequence in context: A091750 A316332 A319025 * A078955 A107673 A130037

Adjacent sequences: A253124 A253125 A253126 * A253128 A253129 A253130

Keyword

nonn

Author

R. H. Hardin, Dec 27 2014

Status

approved