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 A382156 #13 Jul 09 2025 05:08:14
%S A382156 1,3,9,15,31,41,65,79,111,129,169,191,239,265,321,351,415,449,521,559,
%T A382156 639,681,769,815,911,961,1065,1119,1231,1289,1409,1471,1599,1665,1801,
%U A382156 1871,2015,2089,2241,2319,2479,2561,2729,2815,2991,3081,3265,3359,3551,3649,3849,3951,4159,4265,4481,4591,4815,4929,5161,5279,5519
%N A382156 Partial sums of A382155.
%H A382156 Paolo Xausa, <a href="/A382156/b382156.txt">Table of n, a(n) for n = 0..10000</a>
%H A382156 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (1,2,-2,-1,1).
%t A382156 LinearRecurrence[{1, 2, -2, -1, 1}, {1, 3, 9, 15, 31, 41, 65}, 100] (* _Paolo Xausa_, Mar 24 2025 *)
%Y A382156 Cf. A319384, A382154, A382155.
%K A382156 nonn
%O A382156 0,2
%A A382156 _N. J. A. Sloane_, Mar 23 2025