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From: "Mark Mortlock" <arty_guitarist@yahoo.co.uk>
Newsgroups: comp.soft-sys.matlab
Subject: nth term
Date: Mon, 25 Feb 2008 20:20:18 +0000 (UTC)
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1   1   1   1   1    1    1    1
-   -   -   -   -    -    -    -
3   12  30  60  105  168  252  360

The third series of fractions above are worked out using the
formula n(n+1)/2-n.I need to finish off the series of
fractions up to the ninth series. I am stuggling to find the
formula for the fourth series of fractions and beyond.