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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 19 |
| 3 | 49 |
| 4 | 120 |
| 5 | 284 |
| 6 | 656 |
| 7 | 1488 |
| 8 | 3328 |
| 9 | 7360 |
| 10 | 16128 |
| 11 | 35072 |
| 12 | 75776 |
| 13 | 162816 |
| 14 | 348160 |
| 15 | 741376 |
| 16 | 1572864 |
| 17 | 3325952 |
| 18 | 7012352 |
| 19 | 14745600 |
| 20 | 30932992 |
| 21 | 64749568 |
| 22 | 135266304 |
| 23 | 282066944 |
| 24 | 587202560 |
| 25 | 1220542464 |
[1,7,19,49,120,284,656,1488,3328,7360,16128,35072, 75776,162816,348160,741376,1572864,3325952, 7012352,14745600,30932992,64749568,135266304, 282066944,587202560,1220542464] |