id:A116903 - OEIS Search Results

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Seaweeds(n): number of n-step self-avoiding walks on upper two quadrants grid starting at origin.

+0
2

1, 3, 7, 19, 49, 131, 339, 899, 2345, 6199, 16225, 42811, 112285, 296051, 777411, 2049025, 5384855, 14190509, 37313977, 98324565, 258654441, 681552747, 1793492411 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`These walks remind me of fluctuant seaweeds anchored to the sea bottom.`
	EXAMPLE	`The 19 seaweeds of length 3. X marks the origin = anchor point.` `........................................................` `O-O-O...O-O.. .O-O...O-O....O..O-O-O...O......O..O-O....` `....\|.....\|.. .\|.....\|......\|..\|.......\|......\|....\|....` `....X...X-O....O.....O-X....O..X..O-O..O-O....O....O-X..` `...............\|............\|.......\|....\|....\|.........` `O-O.....O-O....X....O.......O..O....O....X..X-O.......O.` `\|.\|.....\|...........\|.......\|..\|....\|.................\|.` `X.O...X-O.....O-O...O-O-X...X..O....X.....O.........O-O.` `..............\|.\|..............\|..........\|.........\|...` `..X-O-O-O.....O.X...O-O-O-X....O-X....X-O-O.........X...` `........................................................`
	CROSSREFS	`Cf. A001411, A038373, A116903.` `Sequence in context: A061646 A017926 A017927 this_sequence A087224 A078059 A018031` `Adjacent sequences: A116900 A116901 A116902 this_sequence A116904 A116905 A116906`
	KEYWORD	`nonn`
	AUTHOR	`Giovanni Resta (g.resta(AT)iit.cnr.it), Feb 15 2006`

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Last modified November 18 20:14 EST 2008. Contains 147244 sequences.

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