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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 45 |
| 3 | 162 |
| 4 | 689 |
| 5 | 4505 |
| 6 | 20842 |
| 7 | 104969 |
| 8 | 623549 |
| 9 | 3195095 |
| 10 | 16779202 |
| 11 | 94570299 |
| 12 | 502818683 |
| 13 | 2684335804 |
| 14 | 14798497776 |
| 15 | 79585694357 |
| 16 | 428251526577 |
| 17 | 2337808909399 |
| 18 | 12622803157240 |
| 19 | 68178468555088 |
| 20 | 370527376656027 |
| 21 | 2003864441765404 |
[5,45,162,689,4505,20842,104969,623549,3195095, 16779202,94570299,502818683,2684335804, 14798497776,79585694357,428251526577, 2337808909399,12622803157240,68178468555088, 370527376656027,2003864441765404] |