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A073581
Factorials successively exponentiated.
1
1, 1, 2, 36, 48708493958471199415506599153950129703565945470976
OFFSET
0,3
COMMENTS
a(5) > 10^(10^50).
FORMULA
a(n) = n!^a(n - 1) starting with a(0)=0!=1.
EXAMPLE
a(3) = 36 because 3!^(2!^(1!^0!)) = 36
MATHEMATICA
a[0] := 1 a[n_Integer] := n!^a[n - 1]
CROSSREFS
Cf. A049384, A358972 (exponents left to right).
Sequence in context: A280420 A051459 A358972 * A078081 A077772 A083150
KEYWORD
easy,nonn
AUTHOR
Jon Kongsvold (Jon.Kongsvold(AT)idi.ntnu.no), Aug 28 2002
EXTENSIONS
Edited by Henry Bottomley, Jul 13 2003
STATUS
approved