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A137583
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Number of elements in the n-th period of the Janet periodic table of elements.
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18
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OFFSET
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1,1
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COMMENTS
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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.
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LINKS
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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
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MATHEMATICA
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Flatten@ Table[2 (n #)^2 & /@ {-1, 1}, {n, 4}] (* Michael De Vlieger, Jul 22 2016 *)
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CROSSREFS
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Cf. A093907, A137508, A138509, A137575.
Sequence in context: A271342 A060818 A082887 * A099328 A073090 A120544
Adjacent sequences: A137580 A137581 A137582 * A137584 A137585 A137586
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KEYWORD
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nonn,less,fini,full
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AUTHOR
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Paul Curtz, Apr 26 2008
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EXTENSIONS
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Edited by R. J. Mathar, Oct 02 2009
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STATUS
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approved
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