cp's OEIS Frontend

A387544 Even terms of A386482, halved, in order of occurrence.

%I A387544 #7 Sep 02 2025 14:10:21
%S A387544 1,2,3,6,5,4,7,9,8,10,15,14,13,12,11,18,17,16,19,27,26,25,24,23,22,21,
%T A387544 20,30,29,28,34,33,32,31,45,44,43,42,41,40,39,38,37,36,35,46,47,69,68,
%U A387544 67,66,65,64,63,62,61,60,59,58,57,56,55,54,53,52,51,50
%N A387544 Even terms of A386482, halved, in order of occurrence.
%C A387544 Each record in the sequence is followed by the smaller missing terms in descending order.
%H A387544 Rémy Sigrist, <a href="/A387544/b387544.txt">Table of n, a(n) for n = 1..10306</a>
%H A387544 Rémy Sigrist, <a href="/A387544/a387544.gp.txt">PARI program</a>
%F A387544 a(a(n)) = n.
%e A387544 The first terms, alongside the first terms of A386482, are:
%e A387544   k   A386482(k)  n   a(n)
%e A387544   --  ----------  --  ----
%e A387544    1           1
%e A387544    2           2   1     1
%e A387544    3           4   2     2
%e A387544    4           6   3     3
%e A387544    5           3
%e A387544    6           9
%e A387544    7          12   4     6
%e A387544    8          10   5     5
%e A387544    9           8   6     4
%e A387544   10          14   7     7
%e A387544   11           7
%e A387544   12          21
%e A387544   13          18   8     9
%e A387544   14          16   9     8
%e A387544   15          20  10    10
%o A387544 (PARI) \\ See Links section.
%Y A387544 Cf. A386482, A387558.
%K A387544 nonn,new
%O A387544 1,2
%A A387544 _Rémy Sigrist_, Sep 01 2025