Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 4500 articles have referenced us, often saying "we would not have discovered this result without the OEIS".
Table of n, a(n) for n=2..27.
A133719 := proc(l)
A133713(l, 4) ;
seq(A133719(l), l=2..30) ; # R. J. Mathar, Nov 23 2011
Sequence in context: A008453 A066573 A121087 * A008948 A003909 A047647
Adjacent sequences: A133716 A133717 A133718 * A133720 A133721 A133722
N. J. A. Sloane, Dec 30 2007