id:A057548 - OEIS Search Results

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A014486-indices of Catalan mountain ranges with no sea-level valleys, i.e. the rooted plane general trees with root degree = 1.

+0
20

1, 3, 7, 8, 17, 18, 20, 21, 22, 45, 46, 48, 49, 50, 54, 55, 57, 58, 59, 61, 62, 63, 64, 129, 130, 132, 133, 134, 138, 139, 141, 142, 143, 145, 146, 147, 148, 157, 158, 160, 161, 162, 166, 167, 169, 170, 171, 173, 174, 175, 176, 180, 181, 183, 184, 185, 187, 188 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`This sequence is induced by the unary form of function 'list' (present in Lisp and Scheme) when it acts on symbolless S-expressions encoded by A014486/A063171.`
	LINKS	`Index entries for the sequences induced by list functions of Lisp`
	FORMULA	`a(n) = A080300(A057547(n)) = A069770(A072795(n)).`
	CROSSREFS	`We have A057515(A057548(n)) = 1 for all n. Row 0 of A072764. Column 1 of A085203. Cf. A057517, A057549, A057551.` `Sequence in context: A031404 A105263 A136136 this_sequence A122227 A125570 A037208` `Adjacent sequences: A057545 A057546 A057547 this_sequence A057549 A057550 A057551`
	KEYWORD	`nonn`
	AUTHOR	`Antti Karttunen (HisFirstname.HisSurname(AT)iki.fi) Sep 07 2000`

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.

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