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| n | a(n) |
|---|---|
| 1 | 40 |
| 2 | 120 |
| 3 | 368 |
| 4 | 1128 |
| 5 | 3456 |
| 6 | 10592 |
| 7 | 32456 |
| 8 | 99464 |
| 9 | 304792 |
| 10 | 934032 |
| 11 | 2862248 |
| 12 | 8771232 |
| 13 | 26878752 |
| 14 | 82368392 |
| 15 | 252412136 |
| 16 | 773501240 |
| 17 | 2370342448 |
| 18 | 7263762024 |
| 19 | 22259317952 |
| 20 | 68212232544 |
| 21 | 209031902280 |
| 22 | 640564615496 |
| 23 | 1962968261720 |
| 24 | 6015387856976 |
[40,120,368,1128,3456,10592,32456,99464,304792, 934032,2862248,8771232,26878752,82368392, 252412136,773501240,2370342448,7263762024, 22259317952,68212232544,209031902280,640564615496, 1962968261720,6015387856976] |