Find-the-next-number-a-0-a-1-1-a-2-2-a-3-

Question Number 185719 by Frix last updated on 26/Jan/23

Find the next number :

a_{0} = a_{1} = 1, a_{2} = 2

a_{3} = ?

Commented by Frix last updated on 26/Jan/23

...of course it's 42 ��

Commented by SEKRET last updated on 26/Jan/23

Answered by Frix last updated on 26/Jan/23

a_{n} = \frac{(n^{2})! \underset{k = 1}{\prod^{n - 1}} \frac{k!}{(n + k)!}}{n!}

a_{3} = 42

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