A168142 Count downwards from 2, then from 8, then from 18, then from ... 2*k^2, k>=1.

2, 1, 8, 7, 6, 5, 4, 3, 2, 1, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31

Offset

1,1

Comments

Janet's extended enumeration of the periodic table of the elements.

The table is read from the right to the left.

References

Charles Janet, La structure du Noyau de l'atome,consideree dans la Classification periodique des elements chimiques, Nov. 1927, N. 2, Beauvais, 67 pages, 3 leafleats, see page 15.

Charles Janet, Considerations sur la structure du noyau de l'atome, Dec 1929, N 5, Beauvais, 2+45 pp.,4 leaflets, see leaflets 2 and 3.

Links

Table of n, a(n) for n=1..80.

Mathematica

Table[Reverse@ Range[2 n^2], {n, 5}] // Flatten (* Michael De Vlieger, Jul 22 2016 *)

Crossrefs

Cf. A138100, A138101, A093907, A137583, A172002.

Sequence in context: A082532 A049250 A060587 * A081800 A254180 A248052

Adjacent sequences: A168139 A168140 A168141 * A168143 A168144 A168145

Keyword

nonn

Author

Paul Curtz, Nov 19 2009

Extensions

Edited by R. J. Mathar, Feb 15 2010

Status

approved