# Greetings from The On-Line Encyclopedia of Integer Sequences! http://oeis.org/

Search: id:a134983
Showing 1-1 of 1

%I A134983 #6 May 31 2018 08:25:02
%S A134983 1,2,4,12,40,168,784,4272,25504,171168,1242688,9915072,84714112,
%T A134983 783454848,7697178880
%N A134983 Number of ways of placing n rooks on an n X n chessboard with the topology of a Klein bottle.
%H A134983 R. W. Whitty, <a href="https://dx.doi.org/10.1016/j.disc.2007.07.054">Rook polynomials on two-dimensional surfaces and graceful labellings of graphs</a>, Discrete Math., 308 (2008), 674-683.
%K A134983 nonn,more
%O A134983 1,2
%A A134983 _N. J. A. Sloane_, Feb 08 2008

# Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE