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A168342 Even atomic numbers in the Janet table of the PSE, read right to left along rows.

%I A168342 #9 Mar 30 2012 18:52:04
%S A168342 2,4,12,10,8,6,20,18,16,14,38,36,34,32,30,28,26,24,22,56,54,52,50,48,
%T A168342 46,44,42,40,88,86,84,82,80,78,76,74,72,70,68,66,64,62,60,58,120,118,
%U A168342 116,114,112,110,108,106,104,102,100,98,96,94,92,90
%N A168342 Even atomic numbers in the Janet table of the PSE, read right to left along rows.
%C A168342 In the Janet arrangement, the elements appear in groups of twice 2, twice 8,... twice 2*k^2, and are here right-aligned:
%C A168342 ...............................1,.2;
%C A168342 ...............................3,.4;
%C A168342 .............5,.6,.7,.8,.9,10,11,12;
%C A168342 ............13,14,15,16,17,18,19,20;
%C A168342 ...28,39.30,31,32,33,34,35,36,37,38;
%C A168342 The even numbers in the table are read top-down, right-to-left and entered into the sequence (which, in consequence, is a permutation of the even numbers.)
%H A168342 A. Tarantola, <a href="http://www.ipgp.fr/~tarantola/Files/Professional/Mendeleev/">Periodic table of elements (Janet form)</a>
%e A168342 Skipping each second (i.e., each odd) element in the table, the result is
%e A168342 2;
%e A168342 4;
%e A168342 12,10,8,6;
%e A168342 20,18,16,14;
%e A168342 38,36,34,32,30,28,..
%e A168342 counting down the even numbers restarting at indices provided by A168380.
%Y A168342 Cf. A138100, A138101, A168142.
%K A168342 nonn,less,tabf
%O A168342 1,1
%A A168342 _Paul Curtz_, Nov 23 2009