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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 22 |
| 4 | 91 |
| 5 | 416 |
| 6 | 1978 |
| 7 | 9738 |
| 8 | 49181 |
| 9 | 253572 |
| 10 | 1328528 |
| 11 | 7053672 |
| 12 | 37866294 |
| 13 | 205188765 |
| 14 | 1120824743 |
| 15 | 6165155890 |
| 16 | 34119043994 |
| 17 | 189839648588 |
| 18 | 1061344406923 |
| 19 | 5959197795092 |
| 20 | 33588952625106 |
| 21 | 189986944364176 |
| 22 | 1078034452020854 |
| 23 | 6134848540680166 |
| 24 | 35005230073846833 |
| 25 | 200229444332667654 |
[1,2,5,22,91,416,1978,9738,49181,253572,1328528, 7053672,37866294,205188765,1120824743,6165155890, 34119043994,189839648588,1061344406923, 5959197795092,33588952625106,189986944364176, 1078034452020854,6134848540680166, 35005230073846833,200229444332667654] |