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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 11 |
| 5 | 76 |
| 6 | 671 |
| 7 | 5916 |
| 8 | 54131 |
| 9 | 504316 |
| 10 | 4779291 |
| 11 | 45898975 |
| 12 | 445798221 |
| 13 | 4371237794 |
| 14 | 43213522209 |
| 15 | 430241859971 |
| 16 | 4310236148075 |
| 17 | 43417944574136 |
| 18 | 439495074016427 |
| 19 | 4468208369691396 |
| 20 | 45605656313488271 |
| 21 | 467140985042718910 |
[1,0,1,1,11,76,671,5916,54131,504316,4779291, 45898975,445798221,4371237794,43213522209, 430241859971,4310236148075,43417944574136, 439495074016427,4468208369691396, 45605656313488271,467140985042718910] |