id:A079223 - OEIS Search Results

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Number of Catalan objects fixed by two-fold application of the gatomorphisms A057511/A057512 (Deep rotation of general parenthesizations/plane trees).

+0
8

1, 1, 2, 5, 11, 26, 66, 161, 420, 1093, 2916, 7819, 21304, 58321, 161233, 448090, 1253252, 3521389, 9941693, 28175716, 80152141, 228747967, 654817275, 1879602446, 5408974390, 15601662378, 45098766532, 130624550412 (list; graph; listen)

	OFFSET	`0,3`
	FORMULA	`a(n) = A079216(n, 2)`
	MAPLE	`A079223 := n -> A079216bi(n, 2);`
	CROSSREFS	`The second row of A079216. The leftmost edge of the triangle A079218 and also its row sums shifted by one. Occurs for first time in A073202 as row 245. Cf. A057546, A079224, A079225, A079226, A079227.` `Sequence in context: A082397 A051286 A025245 this_sequence A095892 A000664 A067922` `Adjacent sequences: A079220 A079221 A079222 this_sequence A079224 A079225 A079226`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (my_firstname.my_surname(AT)iki.fi) Jan 03 2002`

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Last modified December 19 12:50 EST 2009. Contains 171053 sequences.

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