perplexus.info :: Sequences : Fun sequence

Fun sequence (Posted on 2013-03-01)

1, 3, 10, 33, 109, ?...

No Solution Yet Submitted by Math Man

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?... SPOILER

Comment 1 of 1

a(6)=360=3*109+33

a(n)=3*a(n-1)+(n-2)

The solution can be obtained either:

a) by assuming recurrence like a(n)=A*a(n-1)+B*a(n-2)+C
& evaluating A,B,C from the given members of the "fun (?)" seq.

b) check-in @ OEIS

Posted by Ady TZIDON on 2013-03-01 17:52:44

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