%I #9 Dec 07 2019 08:18:28

%S 0,-1,-3,14,15,15,14,12,9,5,-55,-126,-208,-301,-405,-520,-646,-783,

%T -931,-1090,-1260,-1441,-1633,-1836,-2050,-2275,-2511,-2758,-3016,

%U -3285,-3565,12144,12342,12529,12705,12870,13024,13167,13299,13420

%N (1/18)*Difference between concatenation of n and n^2 and concatenation of n^2 and n.

%F a(n) = (A053061(n) - A055436(n))/18 = n*(10^floor(2*log_10(W2)+1) - 1 - n*(10^floor(log_10(W2)+1)-1))/18.

%t Table[((n*10^IntegerLength[x = n^2] + x) - (n^2*10^IntegerLength[n] + n))/18, {n, 40}] (* _Jayanta Basu_, Jul 12 2013 *)

%K base,easy,sign

%O 1,3

%A _Henry Bottomley_, May 18 2000