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 A053667 #13 May 30 2021 10:48:51 %S A053667 0,1,4,9,6,10,18,36,24,8,0,2,16,54,54,20,60,144,24,18,0,16,128,90,210, %T A053667 60,252,126,224,32,0,54,0,0,30,20,108,162,64,10,0,48,168,288,162,0,12, %U A053667 0,0,0,0,0,0,0,108,0,54,216,216,96,0,42,384,1458,0,80,360,1152,192,168,0,0,160 %N A053667 Product of digits of n^2. %H A053667 Harvey P. Dale, <a href="/A053667/b053667.txt">Table of n, a(n) for n = 0..1000</a> %F A053667 a(n) = A007954(n^2). - _Michel Marcus_, Jun 06 2014 %e A053667 a(7)=36 because 7^2=49 and 4*9=36. %t A053667 Times@@@IntegerDigits[Range[0,100]^2] (* _Harvey P. Dale_, May 30 2021 *) %o A053667 (PARI) a(n) = my(d = digits(n^2)); prod(i=1, #d, d[i]); \\ _Michel Marcus_, Jun 06 2014 %K A053667 easy,nonn,base %O A053667 0,3 %A A053667 _Enoch Haga_, Feb 17 2000