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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 8 |
| 3 | 38 |
| 4 | 242 |
| 5 | 1688 |
| 6 | 13238 |
| 7 | 121442 |
| 8 | 1212968 |
| 9 | 13211798 |
| 10 | 160076282 |
| 11 | 2080120448 |
| 12 | 28952201678 |
| 13 | 436718865962 |
| 14 | 6985509376688 |
| 15 | 118290516617198 |
| 16 | 2137197890239202 |
| 17 | 40600129761103688 |
| 18 | 809755594446845558 |
| 19 | 17050115848925513762 |
| 20 | 375062123907891088808 |
| 21 | 8608573107134508912038 |
| 22 | 207014026157802769184402 |
| 23 | 5174962975935097945559048 |
[2,8,38,242,1688,13238,121442,1212968,13211798, 160076282,2080120448,28952201678,436718865962, 6985509376688,118290516617198,2137197890239202, 40600129761103688,809755594446845558, 17050115848925513762,375062123907891088808, 8608573107134508912038,207014026157802769184402, 5174962975935097945559048] |