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A092124
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a(0) = 2, a(n) = (2^(2^n)+2)*a(n-1) for n>0.
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0
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2, 12, 216, 55728, 3652301664, 15686516209310983872, 289365149921256212111714425927549504896, 98465858119637274097902770931519409290135390781788892125023848289699334298368
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,1
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COMMENTS
| In binary representation a(n) can be interpreted as an expression to represent n according to John von Neumann's definition of natural numbers: braces are coded as 1 and 0 and the empty set as 10={};
a(n) = (A001146(n)+2)*a(n-1) = 2*(A058891(n)+1)*a(n-1).
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EXAMPLE
| a(3)=55728='1101100110110000' -> {{}{{}}{{}{{}}}} -> {{},{{}},{{},{{}}}} -> {0,{0},{0,{0}}} -> {0,1,{0,1}} -> {0,1,2} -> A001477(3)=3.
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CROSSREFS
| Sequence in context: A123118 A165950 A083667 * A009525 A009683 A132879
Adjacent sequences: A092121 A092122 A092123 * A092125 A092126 A092127
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KEYWORD
| nonn
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AUTHOR
| Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Mar 30 2004
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