A208964 - OEIS

%I #10 Mar 13 2017 05:18:48

%S 1,1,1,3,3,8,15,42,94,246,613,1645,4361,11980,33023,92484,259762,

%T 735310,2088403,5961138,17070131,49059542,141402328,408736264,

%U 1184435227,3440434897,10014880408,29211476668,85362417183,249882401380,732670159161,2151506490430

%N Number of n-bead necklaces labeled with numbers -2..2 allowing reversal, with sum zero and first and second differences in -2..2.

%H Andrew Howroyd, <a href="/A208964/b208964.txt">Table of n, a(n) for n = 1..100</a>

%e All solutions for n=5:

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

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

%e ..0....0....0

%e ..1....1....0

%e ..0....1....0

%Y Column 2 of A208970.

%K nonn

%O 1,4

%A _R. H. Hardin_, Mar 03 2012

%E a(23)-a(32) from _Andrew Howroyd_, Mar 12 2017