| n | a(n) |
|---|---|
| 0 | 20 |
| 1 | 21 |
| 2 | 167 |
| 3 | 355 |
| 4 | 522 |
| 5 | 877 |
| 6 | 1399 |
| 7 | 19064 |
| 8 | 58591 |
| 9 | 136246 |
| 10 | 331083 |
| 11 | 1791661 |
| 12 | 2122744 |
| 13 | 3914405 |
| 14 | 17780364 |
| 15 | 181718045 |
| 16 | 744652544 |
| 17 | 926370589 |
| 18 | 1671023133 |
| 19 | 9281486254 |
| 20 | 20233995641 |
| 21 | 49749477536 |
| 22 | 169482428249 |
[20,21,167,355,522,877,1399,19064,58591,136246, 331083,1791661,2122744,3914405,17780364,181718045, 744652544,926370589,1671023133,9281486254, 20233995641,49749477536,169482428249] |