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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 19 |
| 3 | 66 |
| 4 | 230 |
| 5 | 1142 |
| 6 | 4344 |
| 7 | 16384 |
| 8 | 72571 |
| 9 | 287634 |
| 10 | 1123621 |
| 11 | 4738249 |
| 12 | 19071326 |
| 13 | 75863351 |
| 14 | 312927750 |
| 15 | 1266297842 |
| 16 | 5084565886 |
| 17 | 20767078273 |
| 18 | 84172477515 |
| 19 | 339590131480 |
| 20 | 1380949668138 |
| 21 | 5599122353424 |
| 22 | 22643152450182 |
| 23 | 91903294604361 |
[3,19,66,230,1142,4344,16384,72571,287634,1123621, 4738249,19071326,75863351,312927750,1266297842, 5084565886,20767078273,84172477515,339590131480, 1380949668138,5599122353424,22643152450182, 91903294604361] |