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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 36 |
| 4 | 189 |
| 5 | 1068 |
| 6 | 6669 |
| 7 | 47568 |
| 8 | 363897 |
| 9 | 2976048 |
| 10 | 26422929 |
| 11 | 248498880 |
| 12 | 2464625205 |
| 13 | 25922981568 |
| 14 | 285884886933 |
| 15 | 3296418423552 |
| 16 | 39795656126193 |
| 17 | 499998631895808 |
| 18 | 6526830528863001 |
| 19 | 88493793850020864 |
| 20 | 1241919513823360941 |
| 21 | 18020032474632956928 |
[1,3,9,36,189,1068,6669,47568,363897,2976048, 26422929,248498880,2464625205,25922981568, 285884886933,3296418423552,39795656126193, 499998631895808,6526830528863001, 88493793850020864,1241919513823360941, 18020032474632956928] |