| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 42 |
| 5 | 201 |
| 6 | 1028 |
| 7 | 5538 |
| 8 | 30666 |
| 9 | 173593 |
| 10 | 1001402 |
| 11 | 5864750 |
| 12 | 34769364 |
| 13 | 208267320 |
| 14 | 1258574116 |
| 15 | 7663720710 |
| 16 | 46976034378 |
| 17 | 289628805623 |
| 18 | 1794932294978 |
| 19 | 11175157356522 |
| 20 | 69864075597442 |
| 21 | 438403736549145 |
| 22 | 2760351027094300 |
| 23 | 17433869214973754 |
| 24 | 110420300879752980 |
[1,2,10,42,201,1028,5538,30666,173593,1001402, 5864750,34769364,208267320,1258574116,7663720710, 46976034378,289628805623,1794932294978, 11175157356522,69864075597442,438403736549145, 2760351027094300,17433869214973754, 110420300879752980] |