A162080 - OEIS

%I #7 Mar 24 2023 10:07:17

%S 5,65,2885,492545,340022021,980195178305,12095799705910085,

%T 651547912318129391105,155578901160322401759995909,

%U 166731137713145923166606394940481

%N Number of n X n symmetric 0..4 arrays with rows, considered as 5-ary numbers, in nondecreasing order.

%H R. H. Hardin, <a href="/A162080/b162080.txt">Table of n, a(n) for n=1..12</a>

%K nonn

%O 1,1

%A _R. H. Hardin_, Jun 25 2009