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A208962 Number of n-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n. 0

%I #7 Mar 13 2017 00:21:44

%S 1,1,2,8,40,495,7425,140429,3014206,73238115,2000005946

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

%C Diagonal of A208970.

%e Some solutions for n=5:

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

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

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

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

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

%K nonn

%O 1,3

%A _R. H. Hardin_, Mar 03 2012

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Last modified April 21 04:17 EDT 2024. Contains 371850 sequences. (Running on oeis4.)