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 A201870 Number of zero-sum -5..5 arrays of n elements with first and second differences also in -5..5 1

%I #5 Mar 31 2012 12:36:45

%S 1,5,27,173,977,5963,36569,229949,1451137,9210249,58617915,374278491,

%T 2396497371,15387074629,99039136267,638882616201,4129364962373,

%U 26735915952717,173368759816541,1125743820087835,7318831174181965

%N Number of zero-sum -5..5 arrays of n elements with first and second differences also in -5..5

%C Column 5 of A201873

%H R. H. Hardin, <a href="/A201870/b201870.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=7

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

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

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_ Dec 06 2011

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Last modified October 1 10:37 EDT 2023. Contains 365819 sequences. (Running on oeis4.)