

A137583


Number of elements in the nth period of the Janet periodic table of elements.


18




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.
Albert Tarantola, PSE of Elements (Janet form).
Anonymous, Janet periodic table, Web Elements Chemistry Nexus
Anonymous, Periodic Table: Formulations, Chemogenesis web book


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


AUTHOR

Paul Curtz, Apr 26 2008


EXTENSIONS

Edited by R. J. Mathar, Oct 02 2009


STATUS

approved



