%I #21 Feb 16 2025 08:33:13
%S 3,30,265,2351,21062,191630,1766955,16465551,154749588,1464326721,
%T 13932672360,133165432342,1277568139729,12295904124627,
%U 118665023703067,1147922359531155
%N The number of n-digit numbers requiring 2 nonzero squares in their representation as sum of squares.
%C A049415(n) + a(n) + A180429(n) + A180347(n) = A052268(n)
%H Eric W. Weisstein: <a href="https://mathworld.wolfram.com/LagrangesFour-SquareTheorem.html">MathWorld -- Lagrange's Four-Square Theorem.</a>
%H Eric W. Weisstein: <a href="https://mathworld.wolfram.com/SumofSquaresFunction.html">MathWorld -- Sum of Squares Function.</a>
%F a(n) = A180416(n)-A180416(n-1) for n>1.
%Y Cf. A000404, A180416.
%K nonn,more,base,changed
%O 1,1
%A _Martin Renner_, Jan 19 2011
%E a(5)-a(8) from _Alois P. Heinz_, Jan 20 2011
%E a(9)-a(10) from _Donovan Johnson_, Jul 01 2011
%E a(10) corrected and a(11)-a(16) added by _Hiroaki Yamanouchi_, Aug 30 2014