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 A377748 #32 Nov 18 2024 18:27:46
%S A377748 0,0,0,0,4,4,4,4,12,12,22,22,34,34,48,48,64,64,64,64,84,84,106,129,
%T A377748 129,154,154,181,181,210,210,241,241,241,241,276,276,313,351,351,391,
%U A377748 391,433,433,477,477,523,523,571,571,621,621,673,673,727,727,783,783,841,841
%N A377748 a(n) = (A000217(n) - A005132(n))/2.
%C A377748 a(n) is the sum of the down steps in the first n terms of Recamán's sequence A005132.
%H A377748 <a href="/index/Rea#Recaman">Index entries for sequences related to Recamán's sequence</a>
%F A377748 a(n) = Sum_{k=1..n} max(0, -A160356(k)).
%e A377748 a(0) = (0-0)/2, a(1) = (1-1)/2, a(2) = (3-3)/2, a(3) = (6-6)/2, a(4) = (10-2)/2, a(5) = (15-7)/2 ... .
%Y A377748 Cf. A000217, A005132, A160356.
%K A377748 nonn
%O A377748 0,5
%A A377748 _Paul Curtz_, Nov 06 2024