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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 86 |
| 4 | 509 |
| 5 | 3065 |
| 6 | 19088 |
| 7 | 120401 |
| 8 | 771758 |
| 9 | 4991255 |
| 10 | 32580974 |
| 11 | 214030883 |
| 12 | 1414515215 |
| 13 | 9392000723 |
| 14 | 62625868280 |
| 15 | 419056150250 |
| 16 | 2812961273801 |
| 17 | 18933686864261 |
| 18 | 127752378798614 |
| 19 | 863851325189957 |
| 20 | 5852685174009545 |
| 21 | 39721858765234379 |
| 22 | 270018313988209400 |
| 23 | 1838154015475958213 |
[1,3,16,86,509,3065,19088,120401,771758,4991255, 32580974,214030883,1414515215,9392000723, 62625868280,419056150250,2812961273801, 18933686864261,127752378798614,863851325189957, 5852685174009545,39721858765234379, 270018313988209400,1838154015475958213] |