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 A259710 #18 Mar 25 2019 04:25:28 %S A259710 0,2,14,30,38,918,31190,1261014,1925823958,66980978212310, %T A259710 88736005061423513046,284201453518322998760440446422, %U A259710 21227119308677323964491588521405117134126550,1978879038810329481388510354539283798664092126944649356922961366 %N A259710 Describe previous term in binary, then convert to decimal (initial term is 0). %H A259710 Kade Robertson, <a href="/A259710/b259710.txt">Table of n, a(n) for n = 1..21</a> %F A259710 a(n) = base-10(A049064(n)). %e A259710 E.g., the term after 14 can be obtained by changing 14 to binary 1110_2, then describing in binary as three (11_2) ones and one (1) zero, concatenate these to make 11110_2, then convert back to decimal to obtain 30. %Y A259710 Cf. A049064, A049190 (initial term is 1). %K A259710 base,easy,nonn %O A259710 1,2 %A A259710 _Kade Robertson_, Jul 03 2015 %E A259710 Offset corrected by _Jianing Song_, Mar 16 2019