For n >= 1, let a(sub)n be the number of ways to write n as an ordered sum of positive integers, where each summand is at least 2.

For example, a(sub)5 = 3 as 5 = 2 + 3 = 3 + 2.

Find a recurrence relation for a(sub)n.

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- November 29th 2009, 08:03 PMsbankicafind a recurrence relation question
For n >= 1, let a(sub)n be the number of ways to write n as an ordered sum of positive integers, where each summand is at least 2.

For example, a(sub)5 = 3 as 5 = 2 + 3 = 3 + 2.

Find a recurrence relation for a(sub)n.