1 1 2 6 | What is the next number in the sequence 1 1 2 6 ?

Find the next number that fits the pattern:

1, 1, 2, 6, ?

4

Explanation:

s(n) = the last digit of n!
0! = 1
1! = 1
2! = 2
3! = 6
4! = 24

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