1,2
a(n) = A075633(n+1) - 1. Also, a(n) = (sqrt(8*(A075631(1) + A075631(2) + ... + A075631(n)) + 1) - 1) / 2. [From Max Alekseyev (maxale(AT)gmail.com), May 08 2009]
Cf. A075631, A075632, A075633.
Sequence in context: A143522 A123310 A058119 this_sequence A007127 A005639 A093730
Adjacent sequences: A075631 A075632 A075633 this_sequence A075635 A075636 A075637
nonn
Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Sep 30 2002
More terms from Jonathan Cross (jcross(AT)juggler.net), May 08 2004
One more term from Max Alekseyev (maxale(AT)gmail.com), May 08 2009
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