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A037967 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 21 |
| 3 | 210 |
| 4 | 2485 |
| 5 | 31878 |
| 6 | 427350 |
| 7 | 5891028 |
| 8 | 82824885 |
| 9 | 1181976510 |
| 10 | 17067482146 |
| 11 | 248817506028 |
| 12 | 3656231188246 |
| 13 | 54086245380300 |
| 14 | 804670817838300 |
| 15 | 12030722583033960 |
| 16 | 180648817921816245 |
| 17 | 2722858996178147310 |
| 18 | 41179040361190612650 |
| 19 | 624643836563467851900 |
[1,3,21,210,2485,31878,427350,5891028,82824885, 1181976510,17067482146,248817506028,3656231188246, 54086245380300,804670817838300,12030722583033960, 180648817921816245,2722858996178147310, 41179040361190612650,624643836563467851900] |