This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A067552 #18 Feb 05 2021 05:30:26
%S A067552 0,0,0,0,9,18,27,36,54,72,0,0,0,0,9,27,36,45,72,90,0,0,0,9,18,36,45,
%T A067552 63,81,108,0,0,18,18,36,54,63,81,108,135,9,9,18,27,45,72,90,108,135,
%U A067552 162,18,27,36,45,63,90,108,126,153,180,27,36,45,54,81,108,126,144,180,207
%N A067552 a(n) = SumOfDigits(n)^2 - SumOfDigits(n^2), where SumOfDigits = A007953.
%C A067552 All terms are divisible by 9; see A069912 for the quotient. - _Ivan Neretin_, Sep 01 2016
%H A067552 Ivan Neretin, <a href="/A067552/b067552.txt">Table of n, a(n) for n = 0..10000</a>
%F A067552 a(n) = A007953(n)^2 - A004159(n).
%e A067552 a(16) = SumOfDigits(16)^2 - SumOfDigits(16^2) = (1+6)^2 - SumOfDigits(256) = 7^2 - (2+5+6) = 49 - 13 = 36.
%t A067552 f[n_] := Plus @@ IntegerDigits[n]^2 - Plus @@ (IntegerDigits[n^2]); Table[ f[n], {n, 0, 100}]
%o A067552 (PARI) a(n) = sumdigits(n)^2 - sumdigits(n^2); \\ _Michel Marcus_, Sep 01 2016
%Y A067552 Cf. A004159, A007953, A061909.
%K A067552 nonn,base
%O A067552 0,5
%A A067552 _Reinhard Zumkeller_, Jan 28 2002
%E A067552 Edited by _Robert G. Wilson v_, May 04 2002