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A145548 Number of distinct values taken by 8^8^...^8 (with n 8's and parentheses inserted in all possible ways). 15
1, 1, 2, 4, 9, 20, 48, 115, 286, 719, 1842, 4765, 12482, 32957, 87756, 235198, 634261, 1719312, 4682952, 12808650, 35168306, 96893138, 267794711, 742260014, 2062792103 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..25.

R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the laddered parenthesis, Amer. Math. Monthly 80 (8) (1973), 868-876.

Index entries for sequences related to parenthesizing

CROSSREFS

Cf. A002845, A003018, A003019, A145545, A145546, A145547, A145549, A145550, A000081.

Sequence in context: A292554 A255640 A216403 * A292555 A145549 A292556

Adjacent sequences:  A145545 A145546 A145547 * A145549 A145550 A145551

KEYWORD

more,nonn

AUTHOR

Jon E. Schoenfield, Oct 13 2008

STATUS

approved

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Last modified February 17 21:12 EST 2018. Contains 299297 sequences. (Running on oeis4.)