A297056 - OEIS

%I #7 Dec 27 2017 03:09:52

%S 0,41,559647,2058903341490,1919822469194024912961,

%T 454793583387514185843536081792977,

%U 27368974025724800737173203530619000355806000376,418403166660689804867337021992321072270266489726877793864921013

%N Number of edge covers in the n X n king graph.

%H Andrew Howroyd, <a href="/A297056/b297056.txt">Table of n, a(n) for n = 1..20</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/EdgeCover.html">Edge Cover</a>

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/KingGraph.html">King Graph</a>

%Y Main diagonal of A297205.

%K nonn

%O 1,2

%A _Eric W. Weisstein_, Dec 24 2017

%E Terms a(4) and beyond from _Andrew Howroyd_, Dec 26 2017