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A137508
Successive structures of alkaline earth metals (periodic table elements from 2nd column).
3
2, 2, 2, 8, 2, 2, 8, 8, 2, 2, 8, 18, 8, 2, 2, 8, 18, 18, 8, 2, 2, 8, 18, 32, 18, 8, 2
OFFSET
1,1
COMMENTS
Apparently a(n) = A168281(n+1). - Georg Fischer, Nov 11 2021
EXAMPLE
27 terms: 2, 2 for beryllium, ... Every structure is palindromic (even and odd mixed). Also 2*A106314.
CROSSREFS
Cf. A005993, A099956, A168281. Same numbers as in A093907.
Sequence in context: A132697 A160689 A179976 * A055921 A029605 A367189
KEYWORD
nonn
AUTHOR
Paul Curtz, Apr 23 2008
STATUS
approved