A137508 Successive structures of alkaline earth metals (periodic table elements from 2nd column).

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

Author

Paul Curtz, Apr 23 2008

Keywords

• nonn

Comments

Apparently a(n) = A168281(n+1). - Georg Fischer, Nov 11 2021

Examples

			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.