n | a(n) |
---|---|
1 | 1 |
2 | 7 |
3 | 20 |
4 | 57 |
5 | 156 |
6 | 438 |
7 | 1220 |
8 | 3398 |
9 | 9468 |
10 | 26380 |
11 | 73496 |
12 | 204780 |
13 | 570556 |
14 | 1589672 |
15 | 4429140 |
16 | 12340436 |
17 | 34382820 |
18 | 95797176 |
19 | 266909376 |
20 | 743660900 |
21 | 2071982512 |
22 | 5772942284 |
23 | 16084528900 |
24 | 44814595084 |
25 | 124862092120 |
26 | 347889834096 |
[1,7,20,57,156,438,1220,3398,9468,26380,73496, 204780,570556,1589672,4429140,12340436,34382820, 95797176,266909376,743660900,2071982512, 5772942284,16084528900,44814595084,124862092120, 347889834096] |