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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 50 |
| 3 | 322 |
| 4 | 2066 |
| 5 | 13262 |
| 6 | 85126 |
| 7 | 546410 |
| 8 | 3507314 |
| 9 | 22512862 |
| 10 | 144506294 |
| 11 | 927561722 |
| 12 | 5953863490 |
| 13 | 38216853518 |
| 14 | 245307588134 |
| 15 | 1574588362378 |
| 16 | 10107019231634 |
| 17 | 64875265300670 |
| 18 | 416423472774166 |
| 19 | 2672952594083738 |
| 20 | 17157235452223586 |
| 21 | 110129423550044398 |
[1,8,50,322,2066,13262,85126,546410,3507314, 22512862,144506294,927561722,5953863490, 38216853518,245307588134,1574588362378, 10107019231634,64875265300670,416423472774166, 2672952594083738,17157235452223586, 110129423550044398] |