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A228217 Number of second differences of arrays of length n+2 of numbers in 0..7 1

%I #4 Aug 16 2013 09:01:16

%S 29,519,7309,88215,951049,9399615,86929081,766106895,6537612649,

%T 54701587935,452558355481,3719467815855,30436607366089,

%U 248242046141055,2019169299698041,16385984911571535,132716292890482729

%N Number of second differences of arrays of length n+2 of numbers in 0..7

%C Column 7 of A228218

%H R. H. Hardin, <a href="/A228217/b228217.txt">Table of n, a(n) for n = 1..210</a>

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

%e Some solutions for n=4

%e .-8....0...-8....1....4..-11....3....7..-10...-1...-4....4...-2....8...-3...-9

%e .13...-2...-1....5...-3....7....0...-4....3...10....8...-2...-8...-4....5...11

%e -12...-3....4...-7...-4...-3...-5....8...-1..-13....0...-3....7...-8....3...-1

%e ..8....9....2....4....1....3...-2..-11....6...12..-10...-3....7...11...-3...-4

%K nonn

%O 1,1

%A _R. H. Hardin_ Aug 16 2013

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Last modified April 19 10:56 EDT 2024. Contains 371791 sequences. (Running on oeis4.)