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| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 9 |
| 3 | 27 |
| 4 | 268 |
| 5 | 1054 |
| 6 | 7870 |
| 7 | 32456 |
| 8 | 324520 |
| 9 | 1448518 |
| 10 | 13349337 |
| 11 | 61168861 |
| 12 | 582447092 |
| 13 | 2667675278 |
| 14 | 25167816397 |
| 15 | 116215506504 |
| 16 | 1101742440518 |
| 17 | 5106861518886 |
| 18 | 48395601269097 |
| 19 | 225029816638813 |
| 20 | 2136499931073357 |
| 21 | 9958380357597902 |
[5,9,27,268,1054,7870,32456,324520,1448518, 13349337,61168861,582447092,2667675278, 25167816397,116215506504,1101742440518, 5106861518886,48395601269097,225029816638813, 2136499931073357,9958380357597902] |