|
| |
|
|
A145547
|
|
Number of distinct values taken by 7^7^...^7 (with n 7's and parentheses inserted in all possible ways).
|
|
11
| |
|
|
1, 1, 2, 4, 9, 20, 48, 115, 286, 719, 1841, 4762, 12470, 32918, 87628, 234795, 633000, 1715435, 4671098, 12772707, 35059815, 96567161, 266818396, 739344427
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,3
|
|
|
REFERENCES
| R. K. Guy and J. L. Selfridge, The nesting and roosting habits of the laddered parenthesis. Amer. Math. Monthly 80 (1973), 868-876.
|
|
|
LINKS
| Index entries for sequences related to parenthesizing
|
|
|
CROSSREFS
| Cf. A002845, A003018, A003019, A145545, A145546, A145548, A145549, A145550, A000081.
Sequence in context: A034825 A145546 A034826 * A123467 A145548 A145549
Adjacent sequences: A145544 A145545 A145546 * A145548 A145549 A145550
|
|
|
KEYWORD
| more,nonn
|
|
|
AUTHOR
| Jon E. Schoenfield (jonscho(AT)hiwaay.net), Oct 13 2008
|
| |
|
|
