A075634 Final terms of groups in A075631.

1, 2, 5, 18, 98, 306, 9378, 1726173, 13347339101, 321699559882750173, 4716070968330003553938242926173, 23987291841663781653328392594255840802707701158676395298

Offset

1,2

Links

Table of n, a(n) for n=1..12.

Formula

a(n) = A075633(n+1) - 1. Also, a(n) = (sqrt(8*(A075631(1) + A075631(2) + ... + A075631(n)) + 1) - 1) / 2. [From Max Alekseyev, May 08 2009]

Crossrefs

Cf. A075631, A075632, A075633.

Sequence in context: A075441 A187008 A333837 * A322396 A007127 A279207

Adjacent sequences: A075631 A075632 A075633 * A075635 A075636 A075637

Keyword

nonn

Author

Amarnath Murthy, Sep 30 2002

Extensions

More terms from Jonathan Cross (jcross(AT)juggler.net), May 08 2004

One more term from Max Alekseyev, May 08 2009

Status

approved