n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 16 |
4 | 81 |
5 | 299 |
6 | 1358 |
7 | 5567 |
8 | 23350 |
9 | 91998 |
10 | 351058 |
11 | 1269907 |
12 | 4394634 |
13 | 14495236 |
14 | 45779246 |
15 | 138567568 |
16 | 403282017 |
17 | 1130773069 |
18 | 3062535192 |
19 | 8028046724 |
20 | 20411824364 |
21 | 50429813556 |
22 | 121280243676 |
23 | 284360432241 |
24 | 650972702410 |
[1,1,6,16,81,299,1358,5567,23350,91998,351058, 1269907,4394634,14495236,45779246,138567568, 403282017,1130773069,3062535192,8028046724, 20411824364,50429813556,121280243676,284360432241, 650972702410] |