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Search: id:A072191
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| 0, 2, 6, 38, 1446, 2090918, 4371938082726, 19113842599189892819591078, 365338978906606237729724396156395693696687137202086, 133472569508521677503139972517335009022889462418844369330479463819154657319297609174034202576402751398
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Eric Weisstein's World of Mathematics, Weakly Binary Tree
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EXAMPLE
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0^2+2=2, 2^2+2=6, 6^2+2=38 ...
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MATHEMATICA
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Table[ a[n], {n, 0, 10}]
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PROGRAM
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(PARI) a(n)=if(n<1, 0, 2+a(n-1)^2) /* Michael Somos Mar 25 2006 */
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CROSSREFS
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Cf. A003095.
Sequence in context: A006536 A057297 A005530 this_sequence A118324 A060421 A054970
Adjacent sequences: A072188 A072189 A072190 this_sequence A072192 A072193 A072194
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KEYWORD
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easy,nonn
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AUTHOR
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Miklos Kristof (kristmikl(AT)freemail.hu), Jul 02 2002
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EXTENSIONS
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Edited by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 03 2002
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