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 A208967 Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and first and second differences in -5..5. 0

%I

%S 1,2,2,11,40,221,1185,6883,39143,224991,1299553,7598452,44893012,

%T 267934513

%N Number of n-bead necklaces labeled with numbers -5..5 allowing reversal, with sum zero and first and second differences in -5..5.

%C Column 5 of A208970.

%e Some solutions for n=5:

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

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

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

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

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 03 2012

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Last modified November 28 01:24 EST 2021. Contains 349396 sequences. (Running on oeis4.)