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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 22 |
| 2 | 64 |
| 3 | 188 |
| 4 | 554 |
| 5 | 1636 |
| 6 | 4838 |
| 7 | 14322 |
| 8 | 42432 |
| 9 | 125796 |
| 10 | 373142 |
| 11 | 1107334 |
| 12 | 3287396 |
| 13 | 9762746 |
| 14 | 29001508 |
| 15 | 86175356 |
| 16 | 256122234 |
| 17 | 761382468 |
| 18 | 2263815846 |
| 19 | 6732159798 |
| 20 | 20023329732 |
| 21 | 59563612974 |
| 22 | 177208108824 |
| 23 | 527277840216 |
| 24 | 1569079157000 |
[1,22,64,188,554,1636,4838,14322,42432,125796, 373142,1107334,3287396,9762746,29001508,86175356, 256122234,761382468,2263815846,6732159798, 20023329732,59563612974,177208108824,527277840216, 1569079157000] |