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A201041 Number of -7..7 arrays of n elements with adjacent element differences also in -7..7.

%I A201041 #7 Jun 02 2025 07:20:15
%S A201041 15,169,1975,23045,268983,3139529,36644243,427707523,4992154799,
%T A201041 58267877227,680096201983,7938007456913,92651542829899,
%U A201041 1081418534229055,12622197218251193,147324886317031649,1719559736948358761
%N A201041 Number of -7..7 arrays of n elements with adjacent element differences also in -7..7.
%C A201041 Column 7 of A201042
%H A201041 R. H. Hardin, <a href="/A201041/b201041.txt">Table of n, a(n) for n = 1..210</a>
%F A201041 Empirical: a(n) = 11*a(n-1) +10*a(n-2) -24*a(n-3) -15*a(n-4) +13*a(n-5) +7*a(n-6) -2*a(n-7) -a(n-8)
%e A201041 Some solutions for n=4
%e A201041 ..2...-6....4...-6....6....2...-2....4...-6...-3....7....6....6...-2....4...-3
%e A201041 ..0...-6....2...-1....7...-3...-4....1...-3....1....6....0....5...-6....1...-1
%e A201041 ..1...-1...-5....6....0....3....3....7...-6...-2....4...-4....1...-3...-2....5
%e A201041 .-5....3...-1....0....3....5....7....4....0....2...-3...-4....1....3...-2....4
%K A201041 nonn
%O A201041 1,1
%A A201041 _R. H. Hardin_ Nov 26 2011