A159406 - OEIS

%I #5 Dec 18 2015 18:17:20

%S 46,91930,140711904,225806690703,250593181727052,179001707241146535,

%T 75883146328596287296,18277998911418077944389,

%U 2521047787492275773799084,210383258780959085774161729,11422723249364268387819064596

%N Number of n X n arrays of squares of integers with every (n-1)X(n-1) subblock summing to 20

%H R. H. Hardin, <a href="/A159406/b159406.txt">Table of n, a(n) for n=3..18</a>

%K nonn

%O 3,1

%A _R. H. Hardin_ Apr 11 2009