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

2, 4, 12, 10, 8, 6, 20, 18, 16, 14, 38, 36, 34, 32, 30, 28, 26, 24, 22, 56, 54, 52, 50, 48, 46, 44, 42, 40, 88, 86, 84, 82, 80, 78, 76, 74, 72, 70, 68, 66, 64, 62, 60, 58, 120, 118, 116, 114, 112, 110, 108, 106, 104, 102, 100, 98, 96, 94, 92, 90

Offset: 1

Author

Paul Curtz, Nov 23 2009

Keywords

• nonn
• less
• tabf

Comments

In the Janet arrangement, the elements appear in groups of twice 2, twice 8,... twice 2*k^2, and are here right-aligned:

...............................1,.2;

...............................3,.4;

.............5,.6,.7,.8,.9,10,11,12;

............13,14,15,16,17,18,19,20;

...28,39.30,31,32,33,34,35,36,37,38;

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.)

Examples

			Skipping each second (i.e., each odd) element in the table, the result is
2;
4;
12,10,8,6;
20,18,16,14;
38,36,34,32,30,28,..
counting down the even numbers restarting at indices provided by A168380.
		

Links

• A. Tarantola, Periodic table of elements (Janet form)

Crossrefs

Cf. A138100, A138101, A168142.