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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 34 |
| 3 | 6 |
| 4 | 185 |
| 5 | 579 |
| 6 | 3307 |
| 7 | 13778 |
| 8 | 69160 |
| 9 | 325394 |
| 10 | 1617897 |
| 11 | 7900112 |
| 12 | 39099845 |
| 13 | 191624353 |
| 14 | 944384511 |
| 15 | 4643953567 |
| 16 | 22870757049 |
| 17 | 112585762631 |
| 18 | 554562217248 |
| 19 | 2730604865872 |
| 20 | 13448526185881 |
| 21 | 66230043593237 |
| 22 | 326180992906896 |
[0,34,6,185,579,3307,13778,69160,325394,1617897, 7900112,39099845,191624353,944384511,4643953567, 22870757049,112585762631,554562217248, 2730604865872,13448526185881,66230043593237, 326180992906896] |