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Less than20 seconds

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Billy Reid S | 15:25 Fri 08th May 2009 | Quizzes & Puzzles
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My grandson who is a trainee architect reckons he figured this out in less than 20 seconds, anyone out there who can prove him right??....
Whats the next number? 1 - 6- 15 - 20 - 350 - 4500 - ??
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1 6 15 20 is half a row of a pascal triangle but I can't see where the other numbers fit in.
If you can encourage your grandson (Gunga Din?) to let you tell us what answer he arrived at, and why, we'll be glad to comment.

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