| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 10 |
| 2 | 46 |
| 3 | 226 |
| 4 | 1214 |
| 5 | 7106 |
| 6 | 44958 |
| 7 | 305090 |
| 8 | 2206398 |
| 9 | 16913986 |
| 10 | 136823262 |
| 11 | 1163490498 |
| 12 | 10366252030 |
| 13 | 96491364674 |
| 14 | 935976996126 |
| 15 | 9440144423874 |
| 16 | 98800604237118 |
| 17 | 1071092025420866 |
| 18 | 12008090971866206 |
| 19 | 139014305916844738 |
[2,10,46,226,1214,7106,44958,305090,2206398, 16913986,136823262,1163490498,10366252030, 96491364674,935976996126,9440144423874, 98800604237118,1071092025420866,12008090971866206, 139014305916844738] |