A154476 - OEIS

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A154476

Number of e's in each iteration of Wolfram's e[x_][y_] -> x[x[y]] symbolic rewriting system, starting from the initial state e[e[e][e]][e][e]

6, 8, 8, 9, 9, 15, 20, 25, 29, 32, 37, 43, 46, 48, 50, 51, 51, 51, 52, 52, 52, 55, 56, 56, 56, 57, 57, 57, 59, 61, 62, 62, 62, 63, 63, 63, 66, 67, 67, 67, 68, 68, 68, 71, 73, 75, 76, 76, 76, 77, 77, 77, 80, 81, 81, 81, 82, 82, 82, 84, 86, 87, 87, 87, 88, 88, 88, 93, 94, 94 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	LINKS	`A. Karttunen, Table of n, a(n) for n = 0..100` `S. Wolfram, A New Kind of Science, Wolfram Media Inc., (2002), p. 102, p. 103 and pages 104, 896-898.`
	FORMULA	`a(n) = A072643(A154471(n)) - A072643(A154472(n)).`
	EXAMPLE	`The iteration starts from the initial term e[e[e][e]][e][e], which contains 6 e's, thus a(0)=6.`
	CROSSREFS	`a(n) = A154475(n)+1.` `Sequence in context: A157683 A049110 A113697 * A185200 A047876 A135581` `Adjacent sequences: A154473 A154474 A154475 * A154477 A154478 A154479`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (His-Firstname.His-Surname(AT)gmail.com), Jan 11 2009`

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Last modified February 14 20:38 EST 2012. Contains 205663 sequences.