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 A018031 #11 Sep 08 2022 08:44:44
%S A018031 1,3,7,19,51,135,361,963,2570,6859,18303,48839,130321,347749,927933,
%T A018031 2476099,6607227,17630734,47045881,125537306,334983955,893871739,
%U A018031 2385208822,6364695153,16983563041,45318967620,120929207915,322687697779,861060384776,2297654950385
%N A018031 Powers of cube root of 19 rounded to nearest integer.
%H A018031 Vincenzo Librandi, <a href="/A018031/b018031.txt">Table of n, a(n) for n = 0..200</a>
%t A018031 Table[Round[19^(n/3)], {n, 0, 40}] (* _Vincenzo Librandi_, Jan 08 2014 *)
%o A018031 (Magma) [Round(19^(n/3)): n in [0..40]]; // _Vincenzo Librandi_, Jan 08 2014
%Y A018031 Cf. powers of cube root of k rounded up: A017980 (k=2), A017983 (k=3), A017986 (k=4), A017989 (k=5), A017992 (k=6), A017995 (k=7), A018001 (k=9), A018004 (k=10), A018007 (k=11), A018010 (k=12), A018013 (k=13), A018016 (k=14), A018019 (k=15), A018022 (k=16), A018025 (k=17), A018028 (k=18), this sequence (k=19), A018034 (k=20), A018037 (k=21), A018040 (k=22), A018043 (k=23), A018046 (k=24).
%K A018031 nonn
%O A018031 0,2
%A A018031 _N. J. A. Sloane_
%E A018031 More terms from _Vincenzo Librandi_, Jan 08 2014