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Search: id:A133376
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| A133376 |
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a(n)=(...(2^3)^4)^...)^n |
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+0
1
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| 2, 8, 4096, 1152921504606846976, 2348542582773833227889480596789337027375682548908319870707290971532209025114608443463698998384768703031934976
(list; graph; listen)
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OFFSET
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2,1
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COMMENT
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Another kind of exponential factorial.
See crossrefs for other possible definition of exponential factorials. Some other terms of the sequence can be computed, but they are quite large and it wouldn't be very convenient to display them.
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EXAMPLE
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a(4)=4096, as (2^3)^4=4096
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MAPLE
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expfact:=proc(n::integer) > local i, res; > res:=2; > for i from 3 to n do res:=(res)^i od; > res > end proc;
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CROSSREFS
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Cf. A124075, A049384.
Sequence in context: A054874 A057841 A135238 this_sequence A038582 A058437 A046967
Adjacent sequences: A133373 A133374 A133375 this_sequence A133377 A133378 A133379
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KEYWORD
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base,nonn
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AUTHOR
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Pierre Karpman (pierre.karpman(AT)laposte.net), Oct 28 2007
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