A238925 - OEIS

%I #6 Aug 19 2022 12:48:59

%S 782,13090,611524,22636472,873385842,33476445936,1285018853980,

%T 49292627209040,1891392997403558,72570437804912088,

%U 2784363198852086944,106832018867134432242,4098974312510426370434,157270670608326130217658

%N Number of (n+1) X (3+1) 0..3 arrays with no element greater than all horizontal neighbors or equal to all vertical neighbors.

%C Column 3 of A238929.

%H R. H. Hardin, <a href="/A238925/b238925.txt">Table of n, a(n) for n = 1..210</a>

%e Some solutions for n=2

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

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

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

%Y Cf. A238929.

%K nonn

%O 1,1

%A _R. H. Hardin_, Mar 07 2014