A228259 Number of third differences of arrays of length n+3 of numbers in 0..7

57, 1723, 36471, 596591, 7795501, 83538705, 761638071, 6537612649, 54701587935, 452558355481, 3719467815855, 30436607366089, 248242046141055, 2019169299698041, 16385984911571535, 132716292890482729

Offset

1,1

Comments

Column 7 of A228260

Links

R. H. Hardin, Table of n, a(n) for n = 1..75

Formula

Empirical: a(n) = 15*a(n-1) -56*a(n-2) for n>14

Example

Some solutions for n=4
..3....0....3....0....0....0..-11..-11..-11..-14....3..-11....1....0...14....0
..0...-1..-18...13...-7..-11...19...11....6....7...14...-7....8..-13...-4..-12
..7...10...10..-23....4...14..-19....6...-2...10..-18...11..-11...18....2...17
-22..-20....5...21....1..-12....4..-19...-1..-16....9...-1....6...-4....3....0

Crossrefs

Sequence in context: A017720 A009702 A282932 * A229407 A270502 A285238

Adjacent sequences: A228256 A228257 A228258 * A228260 A228261 A228262

Keyword

nonn

Author

R. H. Hardin Aug 19 2013

Status

approved