A172743 - OEIS

%I #10 Apr 18 2020 22:23:29

%S 1,7,55,415,3391,28681,248137,2186815,19546975,176703337,1612210777,

%T 14823083089,137176167025,1276548044695,11936862061495,

%U 112092031526335,1056512066133055,9991003788000025,94760438267696425,901154863603211665

%N Number of n X 3 0..3 arrays with row sums 3 and column sums n.

%H R. H. Hardin, <a href="/A172743/b172743.txt">Table of n, a(n) for n=1..99</a>

%Y Column k=3 of A333901.

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 06 2010