cp's OEIS Frontend

A202251 Number of zero-sum -7..7 arrays of n elements with adjacent element differences also in -7..7.

%I A202251 #7 Jun 02 2025 07:24:55
%S A202251 1,7,75,779,8211,88301,960501,10536609,116366779,1292162535,
%T A202251 14412747241,161362353297,1812334370533,20410840535049,
%U A202251 230416525827147,2606567584536987,29540755940559963,335338507713978229
%N A202251 Number of zero-sum -7..7 arrays of n elements with adjacent element differences also in -7..7.
%C A202251 Column 7 of A202252
%H A202251 R. H. Hardin, <a href="/A202251/b202251.txt">Table of n, a(n) for n = 1..210</a>
%e A202251 Some solutions for n=6
%e A202251 .-3....3....6...-2...-7...-5....6...-5...-5....1...-4....3....5...-2....4...-3
%e A202251 ..3....3....0...-1...-7...-2...-1....2...-1....4....3....4...-2...-5....0...-2
%e A202251 ..3...-3....1....3....0....5....3....3....2...-2....2...-2....2...-3...-6....1
%e A202251 .-4....4...-3....0....7...-1...-1...-1....2....4...-1...-6....0...-1....1...-2
%e A202251 ..3...-2...-3...-2....2....0...-3....1....0...-1....0...-1....1....6....4....1
%e A202251 .-2...-5...-1....2....5....3...-4....0....2...-6....0....2...-6....5...-3....5
%K A202251 nonn
%O A202251 1,2
%A A202251 _R. H. Hardin_ Dec 14 2011