(not)OEIS 1

Level pending

define a(n): 1, 4, 24, 236, 3010. What's next?

This sequence combines 3 patterns. a ( n ) = a 1 ( n ) − a 2 ( n ) + a 3 ( n ) a(n)=a_1(n)-a_2(n)+a_3(n)

All 3 patterns are not very hard...

It was so hard to find a pattern that OEIS doesn't have...


The answer is 45942.

Aloysius Ng by Aloysius Ng , 20, Singapore

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1 solution

Joel Tan
Dec 15, 2014

a ( n ) = n n − n ! + n ⟹ a 6 = 45942 a(n)=n^{n}-n!+n \implies a_{6}=45942

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