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%I #6 Jan 15 2022 22:25:11
%S 318659,11314071,463425639,17145057973,629694824303,23667617769817,
%T 891996903006527,33481355214548009,1258684591767307311,
%U 47365710615235761413,1782764221799264814205,67097943667181977772419
%N Number of ways to place any number of black and any number of white nonattacking knights on a (n+2) X (3+2) board.
%C Column 3 of A251531.
%H R. H. Hardin, <a href="/A251528/b251528.txt">Table of n, a(n) for n = 1..210</a>
%e Some solutions for n=1
%e ..0..0..0..0..0....0..0..2..2..0....0..2..0..0..0....0..0..0..0..0
%e ..0..2..2..2..0....0..0..1..2..2....0..0..1..0..2....0..2..0..1..0
%e ..0..2..2..0..2....1..2..0..0..0....0..2..2..1..1....2..1..2..2..1
%Y Cf. A251531.
%K nonn
%O 1,1
%A _R. H. Hardin_, Dec 04 2014