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| n | a(n) |
|---|---|
| 1 | 147 |
| 2 | 810 |
| 3 | 3616 |
| 4 | 15281 |
| 5 | 67518 |
| 6 | 304870 |
| 7 | 1369052 |
| 8 | 6118942 |
| 9 | 27356256 |
| 10 | 122402144 |
| 11 | 547700666 |
| 12 | 2450461705 |
| 13 | 10963429165 |
| 14 | 49051483677 |
| 15 | 219461893981 |
| 16 | 981894966609 |
| 17 | 4393096675995 |
| 18 | 19655164658898 |
| 19 | 87939229945039 |
| 20 | 393449138915943 |
[147,810,3616,15281,67518,304870,1369052,6118942, 27356256,122402144,547700666,2450461705, 10963429165,49051483677,219461893981,981894966609, 4393096675995,19655164658898,87939229945039, 393449138915943] |