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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 34 |
| 5 | 120 |
| 6 | 480 |
| 7 | 1864 |
| 8 | 7724 |
| 9 | 31399 |
| 10 | 133843 |
| 11 | 559593 |
| 12 | 2429122 |
| 13 | 10390671 |
| 14 | 45665183 |
| 15 | 198653628 |
| 16 | 881804068 |
| 17 | 3883630079 |
| 18 | 17376449963 |
| 19 | 77271811239 |
| 20 | 347946089164 |
| 21 | 1559298429090 |
| 22 | 7059064851180 |
| 23 | 31835156778887 |
| 24 | 144779224351473 |
| 25 | 656409486987982 |
| 26 | 2996888762486011 |
| 27 | 13649315320686171 |
[1,1,3,9,34,120,480,1864,7724,31399,133843,559593, 2429122,10390671,45665183,198653628,881804068, 3883630079,17376449963,77271811239,347946089164, 1559298429090,7059064851180,31835156778887, 144779224351473,656409486987982,2996888762486011, 13649315320686171] |