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A106474 A006579(4n+4)/4. 0
1, 3, 7, 8, 13, 19, 19, 20, 33, 35, 31, 48, 37, 51, 75, 48, 49, 87, 55, 88, 109, 83, 67, 116, 105, 99, 135, 128, 85, 195, 91, 112, 177, 131, 199, 216, 109, 147, 211, 212, 121, 283, 127, 208, 333, 179, 139, 272, 217, 275, 279, 248, 157, 351, 323, 308, 313, 227, 175 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n)=sum{k=0..4n+2, gcd(4n-k+3, k+1)/4}.

CROSSREFS

Sequence in context: A010342 A108873 A002312 * A127441 A067064 A093722

Adjacent sequences:  A106471 A106472 A106473 * A106475 A106476 A106477

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), May 03 2005

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Last modified February 14 18:33 EST 2012. Contains 205663 sequences.