| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 24 |
| 3 | 152 |
| 4 | 1094 |
| 5 | 8508 |
| 6 | 69565 |
| 7 | 588469 |
| 8 | 5106516 |
| 9 | 45199827 |
| 10 | 406485567 |
| 11 | 3703483221 |
| 12 | 34111556603 |
| 13 | 317103532465 |
| 14 | 2971283282979 |
| 15 | 28033510000286 |
| 16 | 266092385194061 |
| 17 | 2539244496436404 |
| 18 | 24346664830510834 |
| 19 | 234435203932318053 |
| 20 | 2266062742515203697 |
| 21 | 21980115620177318458 |
[1,5,24,152,1094,8508,69565,588469,5106516, 45199827,406485567,3703483221,34111556603, 317103532465,2971283282979,28033510000286, 266092385194061,2539244496436404, 24346664830510834,234435203932318053, 2266062742515203697,21980115620177318458] |