1,2
a(n) = Binomial(A046090(n), 2). - Mitch Harris (maharri(AT)gmail.com), Apr 19 2007
Sequence in context: A001505 A084694 A065945 * A029549 A183252 A183287
Adjacent sequences: A076712 A076713 A076714 * A076716 A076717 A076718
dead