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A122973 Number of vertices on the surface of an icosahedron. +0
1
1, 12, 42, 162, 642, 2562 (list; graph; listen)
OFFSET

0,2

FORMULA

a(n) = 1 if n=0, 10*4^(n-1)+2 otherwise.

CROSSREFS

Cf. A005901.

Sequence in context: A009948 A007586 A066972 this_sequence A074356 A088826 A125221

Adjacent sequences: A122970 A122971 A122972 this_sequence A122974 A122975 A122976

KEYWORD

nonn

AUTHOR

Alden Chew (aldenc98(AT)yahoo.com), Oct 27 2006

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.


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