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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 33 |
| 4 | 123 |
| 5 | 489 |
| 6 | 1947 |
| 7 | 7977 |
| 8 | 32817 |
| 9 | 137253 |
| 10 | 576993 |
| 11 | 2452071 |
| 12 | 10468245 |
| 13 | 45032733 |
| 14 | 194475321 |
| 15 | 844608567 |
| 16 | 3680153043 |
| 17 | 16105438515 |
| 18 | 70677344403 |
| 19 | 311242931097 |
| 20 | 1373860647453 |
| 21 | 6081635195553 |
[1,3,9,33,123,489,1947,7977,32817,137253,576993, 2452071,10468245,45032733,194475321,844608567, 3680153043,16105438515,70677344403,311242931097, 1373860647453,6081635195553] |