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A099202 2^floor(n^2/2). +0
1
1, 1, 4, 16, 256, 4096, 262144, 16777216, 4294967296, 1099511627776, 1125899906842624, 1152921504606846976, 4722366482869645213696, 19342813113834066795298816, 316912650057057350374175801344 (list; graph; listen)
OFFSET

0,3

FORMULA

a(n)=A016116(n)*A006125(n)

a(n)=16a(n-2)^2/a(n-4). - Michael Somos Sep 16 2005

PROGRAM

(PARI) a(n)=2^(n^2\2)

CROSSREFS

Sequence in context: A000513 A088027 A113905 this_sequence A139288 A067172 A013089

Adjacent sequences: A099199 A099200 A099201 this_sequence A099203 A099204 A099205

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Oct 04 2004

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


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