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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 39 |
| 4 | 355 |
| 5 | 3532 |
| 6 | 37206 |
| 7 | 407861 |
| 8 | 4604493 |
| 9 | 53169811 |
| 10 | 625067441 |
| 11 | 7456004083 |
| 12 | 90015754691 |
| 13 | 1097834790182 |
| 14 | 13505674728174 |
| 15 | 167395320811562 |
| 16 | 2088350145491232 |
| 17 | 26203315734195937 |
| 18 | 330460721192844017 |
| 19 | 4186559092558049570 |
| 20 | 53255890990455126082 |
| 21 | 679954025388880445771 |
[1,1,5,39,355,3532,37206,407861,4604493,53169811, 625067441,7456004083,90015754691,1097834790182, 13505674728174,167395320811562,2088350145491232, 26203315734195937,330460721192844017, 4186559092558049570,53255890990455126082, 679954025388880445771] |