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A195951 Number of lower triangles of an n X n 0..4 array with no element greater than the number its nonzero horizontal and vertical neighbors 1

%I

%S 1,5,162,19913,10408097,23663085157,233759541159316,

%T 10022979661615617883,1865159356600749113021208,

%U 1506395624918723916292924776440,5280426678910236576404521138602764328

%N Number of lower triangles of an n X n 0..4 array with no element greater than the number its nonzero horizontal and vertical neighbors

%H R. H. Hardin, <a href="/A195951/b195951.txt">Table of n, a(n) for n = 1..13</a>

%e Some solutions for n=4

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

%e ..1.0......1.0......3.1......1.2......2.2......2.2......2.2......1.1

%e ..2.3.1....1.3.1....2.4.1....2.2.2....1.3.1....2.3.2....1.3.0....3.3.0

%e ..2.3.3.1..2.1.1.1..2.1.3.1..2.3.2.1..2.1.2.0..1.1.2.0..0.2.1.1..2.3.1.1

%K nonn

%O 1,2

%A _R. H. Hardin_ Sep 25 2011

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Last modified November 13 23:48 EST 2019. Contains 329106 sequences. (Running on oeis4.)