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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 8 |
| 2 | 142 |
| 3 | 2208 |
| 4 | 16412 |
| 5 | 78160 |
| 6 | 279978 |
| 7 | 823592 |
| 8 | 2097208 |
| 9 | 4783032 |
| 10 | 10000070 |
| 11 | 19487248 |
| 12 | 35831892 |
| 13 | 62748608 |
| 14 | 105413602 |
| 15 | 170859480 |
| 16 | 268435568 |
| 17 | 410338792 |
| 18 | 612220158 |
| 19 | 893871872 |
| 20 | 1280000140 |
| 21 | 1801088688 |
| 22 | 2494358042 |
[0,8,142,2208,16412,78160,279978,823592,2097208, 4783032,10000070,19487248,35831892,62748608, 105413602,170859480,268435568,410338792,612220158, 893871872,1280000140,1801088688,2494358042] |