n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 6 |
6 | 15 |
7 | 30 |
8 | 74 |
9 | 160 |
10 | 379 |
11 | 867 |
12 | 2057 |
13 | 4817 |
14 | 11465 |
15 | 27214 |
16 | 65102 |
17 | 155753 |
18 | 374208 |
19 | 900073 |
20 | 2170500 |
21 | 5240723 |
22 | 12676162 |
23 | 30697119 |
24 | 74435204 |
25 | 180679171 |
[0,1,1,4,6,15,30,74,160,379,867,2057,4817,11465, 27214,65102,155753,374208,900073,2170500,5240723, 12676162,30697119,74435204,180679171] |