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| n | a(n) |
|---|---|
| 1 | 2700 |
| 2 | 10484 |
| 3 | 40167 |
| 4 | 121701 |
| 5 | 426308 |
| 6 | 1351487 |
| 7 | 4771368 |
| 8 | 16058526 |
| 9 | 56235160 |
| 10 | 192884364 |
| 11 | 669557257 |
| 12 | 2305588750 |
| 13 | 7958763182 |
| 14 | 27396735121 |
| 15 | 94312947300 |
| 16 | 324414828833 |
| 17 | 1115586299491 |
| 18 | 3835775446691 |
| 19 | 13186270802164 |
| 20 | 45332896612376 |
[2700,10484,40167,121701,426308,1351487,4771368, 16058526,56235160,192884364,669557257,2305588750, 7958763182,27396735121,94312947300,324414828833, 1115586299491,3835775446691,13186270802164, 45332896612376] |