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A039722 a[ 1 ]=1,a[ m+1 ]=2*sum{k=1 to floor((m+1)/2)}a[ k ]. 1
1, 2, 2, 6, 6, 10, 10, 22, 22, 34, 34, 54, 54, 74, 74, 118, 118, 162, 162, 230, 230, 298, 298, 406, 406, 514, 514, 662, 662, 810, 810, 1046, 1046, 1282, 1282, 1606, 1606 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

a[ 1 ]=1, a[ 2 ]=2, a[ 2m+1 ]=a[ 2m ], a[ 2m+2 ]=a[ 2m+1 ]+2a[ m+1 ] {m is a positive integer.}

EXAMPLE

a[ 6 ]=2*(a[ 1 ]+a[ 2 ]+a[ 3 ])=2*(1+2+2)=10

CROSSREFS

Sequence in context: A055993 A151888 A168276 * A082542 A162776 A032302

Adjacent sequences:  A039719 A039720 A039721 * A039723 A039724 A039725

KEYWORD

easy,nonn

AUTHOR

Leroy Quet

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Last modified February 14 06:20 EST 2012. Contains 205570 sequences.