| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 17 |
| 4 | 55 |
| 5 | 200 |
| 6 | 737 |
| 7 | 2782 |
| 8 | 10881 |
| 9 | 42496 |
| 10 | 171031 |
| 11 | 688475 |
| 12 | 2817527 |
| 13 | 11609784 |
| 14 | 48126841 |
| 15 | 201562885 |
| 16 | 845539099 |
| 17 | 3580412372 |
| 18 | 15187225367 |
| 19 | 64821446779 |
| 20 | 277615705565 |
| 21 | 1192720740882 |
| 22 | 5147664505465 |
| 23 | 22251795763422 |
| 24 | 96607920494837 |
| 25 | 420046638765438 |
| 26 | 1832258309887397 |
| 27 | 8008819832696925 |
[1,2,5,17,55,200,737,2782,10881,42496,171031, 688475,2817527,11609784,48126841,201562885, 845539099,3580412372,15187225367,64821446779, 277615705565,1192720740882,5147664505465, 22251795763422,96607920494837,420046638765438, 1832258309887397,8008819832696925] |