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Number of arrays of -5..5 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero
1

%I #5 Mar 31 2012 12:36:21

%S 1,11,101,1111,6961,52551,396849,2989013,22245343,166691719,

%T 1248626317,9348231385,69979015481,523959788091,3922930719919,

%U 29370668470793,219896678916165,1646364342879165,12326287592918831,92286557411926649

%N Number of arrays of -5..5 integers x(1..n) with every x(i) in a subsequence of length 1, 2, 3 or 4 with sum zero

%C Column 5 of A193710

%H R. H. Hardin, <a href="/A193707/b193707.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=6

%e ..3...-5....3....0...-3....2....4...-1....3...-2...-4....0...-4....2....0...-5

%e .-4....4...-4....2....5...-2....1....1...-3....2....4...-1....1...-2....1....5

%e .-2....1...-4...-2...-4...-3...-4....3....0....2...-3...-2....1....0...-1...-5

%e ..3...-5....5....2....2....2...-1...-3...-4....2...-1....5....2....2....4....1

%e .-5....2....3...-4...-1....1...-1...-3....3....1....4...-2....2....0...-4....0

%e ..2....2....0....2...-1....0....2....3....1...-5...-4...-3...-5...-2....4...-1

%K nonn

%O 1,2

%A _R. H. Hardin_ Aug 02 2011