| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 19 |
| 3 | 58 |
| 4 | 462 |
| 5 | 1608 |
| 6 | 13446 |
| 7 | 48924 |
| 8 | 417440 |
| 9 | 1553940 |
| 10 | 13409576 |
| 11 | 50618184 |
| 12 | 440013462 |
| 13 | 1676640462 |
| 14 | 14649846820 |
| 15 | 56201554888 |
| 16 | 492944907180 |
| 17 | 1900789437276 |
| 18 | 16721000706580 |
| 19 | 64734185205960 |
| 20 | 570792185166764 |
| 21 | 2216888144737508 |
| 22 | 19584623363041704 |
| 23 | 76265067399850848 |
[1,3,19,58,462,1608,13446,48924,417440,1553940, 13409576,50618184,440013462,1676640462, 14649846820,56201554888,492944907180, 1900789437276,16721000706580,64734185205960, 570792185166764,2216888144737508, 19584623363041704,76265067399850848] |