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| n | a(n) |
|---|---|
| 1 | 4656 |
| 2 | 9780 |
| 3 | 19952 |
| 4 | 45128 |
| 5 | 99096 |
| 6 | 236376 |
| 7 | 545768 |
| 8 | 1351904 |
| 9 | 3234336 |
| 10 | 8236464 |
| 11 | 20235512 |
| 12 | 52632200 |
| 13 | 132063816 |
| 14 | 349337952 |
| 15 | 892241120 |
| 16 | 2393564720 |
| 17 | 6209733240 |
| 18 | 16862423016 |
| 19 | 44373812264 |
| 20 | 121811965088 |
| 21 | 324794526624 |
| 22 | 900449967888 |
[4656,9780,19952,45128,99096,236376,545768, 1351904,3234336,8236464,20235512,52632200, 132063816,349337952,892241120,2393564720, 6209733240,16862423016,44373812264,121811965088, 324794526624,900449967888] |