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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 36 |
| 3 | 164 |
| 4 | 750 |
| 5 | 3434 |
| 6 | 15724 |
| 7 | 71970 |
| 8 | 329455 |
| 9 | 1508139 |
| 10 | 6903702 |
| 11 | 31602661 |
| 12 | 144665637 |
| 13 | 662227235 |
| 14 | 3031438038 |
| 15 | 13876832881 |
| 16 | 63523149100 |
| 17 | 290786125630 |
| 18 | 1331114279973 |
| 19 | 6093362338144 |
| 20 | 27893220846536 |
| 21 | 127685131134366 |
| 22 | 584496598744029 |
[8,36,164,750,3434,15724,71970,329455,1508139, 6903702,31602661,144665637,662227235,3031438038, 13876832881,63523149100,290786125630, 1331114279973,6093362338144,27893220846536, 127685131134366,584496598744029] |