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 A245419 #12 Jul 22 2014 20:12:33 %S A245419 8,16,40,112,296,792,2112,5632,15016,40040,106776,284736,759296, %T A245419 2024792,5399440,14398512,38396032,102389416,273038440,728102512, %U A245419 1941606696,5177617856,13806980952,36818615872,98182975656,261821268416,698190049112,1861840130960 %N A245419 Number of nonnegative integers with property that their base 8/3 expansion (see A024645) has n digits. %e A245419 The numbers 8-23 are represented by 30, 31, 32, 33, 34, 35, 36, 37, 60, 61, 62, 63, 64, 65, 66, 67 respectively in base 8/3. These are the only integers with two digits, and so a(2)=16. %o A245419 (Sage) %o A245419 A=[1] %o A245419 for i in [1..60]: %o A245419 A.append(ceil((8-3)/3*sum(A))) %o A245419 [8*x for x in A] %Y A245419 Cf. A024645, A081848. %K A245419 nonn,base %O A245419 1,1 %A A245419 _James Van Alstine_, Jul 21 2014