A137583 Number of elements in the n-th period of the Janet periodic table of elements.

2, 2, 8, 8, 18, 18, 32, 32

Offset

1,1

Comments

Essentially 2 followed by the first terms of A093907.

This puts Hydrogen and Helium in the first row, Lithium and Beryllium into the second, Boron to Magnesium into the third etc.

Links

Table of n, a(n) for n=1..8.

Mark R. Leach, The Internet Database of Periodic Tables, Chemogenesis web book.

Albert Tarantola, PSE of Elements (Janet form).

Mark J. Winter, Image of the Janet long format (or 32-column) periodic table, Web Elements Chemistry Nexus.

Mathematica

Flatten@ Table[2 (n #)^2 & /@ {-1, 1}, {n, 4}] (* Michael De Vlieger, Jul 22 2016 *)

Crossrefs

Cf. A093907, A137508, A138509, A137575.

Sequence in context: A271342 A060818 A082887 * A099328 A073090 A120544

Adjacent sequences: A137580 A137581 A137582 * A137584 A137585 A137586

Keyword

nonn,less,fini,full,changed

Author

Paul Curtz, Apr 26 2008

Extensions

Edited by R. J. Mathar, Oct 02 2009

Status

approved