cp's OEIS Frontend

A228216 Number of second differences of arrays of length n+2 of numbers in 0..6.

%I A228216 #6 Jun 02 2025 08:36:51
%S A228216 25,385,4651,47953,439927,3693505,29066311,219071473,1609259287,
%T A228216 11658284065,83824687591,599858908753,4277376525367,30411820662145,
%U A228216 215703854542471,1526853641242033,10789535445362647,76136107857549025
%N A228216 Number of second differences of arrays of length n+2 of numbers in 0..6.
%C A228216 Column 6 of A228218
%H A228216 R. H. Hardin, <a href="/A228216/b228216.txt">Table of n, a(n) for n = 1..64</a>
%F A228216 Empirical: a(n) = 13*a(n-1) -42*a(n-2) for n>13
%e A228216 Some solutions for n=4
%e A228216 ..0...-7....0....3...-4....6....6....5....6....2...10...-7...-7....9..-10...-1
%e A228216 ..0....1...-2....7....6....4....0...-8...-4...-6..-11....0...12...-4....8....3
%e A228216 ..2...-4....5...-6...-8...-4...-9....7....3...-1....8....9...-7....0....0...-8
%e A228216 .-2....4...-7...-2....5....0....6...-6...-3....8...-5...-8....0....3...-2...12
%K A228216 nonn
%O A228216 1,1
%A A228216 _R. H. Hardin_ Aug 16 2013