n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 9 |
3 | 53 |
4 | 357 |
5 | 2611 |
6 | 20180 |
7 | 162276 |
8 | 1344455 |
9 | 11400944 |
10 | 98498545 |
11 | 864068233 |
12 | 7677040177 |
13 | 68947431898 |
14 | 624960856374 |
15 | 5710352911097 |
16 | 52542826413590 |
17 | 486458467209032 |
18 | 4528570067254485 |
19 | 42365044032385154 |
20 | 398081015128641213 |
[1,2,9,53,357,2611,20180,162276,1344455,11400944, 98498545,864068233,7677040177,68947431898, 624960856374,5710352911097,52542826413590, 486458467209032,4528570067254485, 42365044032385154,398081015128641213] |