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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 4 |
| 4 | 18 |
| 5 | 62 |
| 6 | 302 |
| 7 | 1246 |
| 8 | 6094 |
| 9 | 26914 |
| 10 | 134498 |
| 11 | 609026 |
| 12 | 3063602 |
| 13 | 14101834 |
| 14 | 70953566 |
| 15 | 330924894 |
| 16 | 1660510388 |
| 17 | 7832513154 |
| 18 | 39166394428 |
| 19 | 186507266186 |
| 20 | 929635136724 |
| 21 | 4461584935084 |
| 22 | 22180085525044 |
| 23 | 107124575002552 |
| 24 | 531493854988914 |
[0,3,4,18,62,302,1246,6094,26914,134498,609026, 3063602,14101834,70953566,330924894,1660510388, 7832513154,39166394428,186507266186,929635136724, 4461584935084,22180085525044,107124575002552, 531493854988914] |