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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 36 |
| 3 | 130 |
| 4 | 412 |
| 5 | 1176 |
| 6 | 3105 |
| 7 | 7712 |
| 8 | 18192 |
| 9 | 41098 |
| 10 | 89476 |
| 11 | 188592 |
| 12 | 386322 |
| 13 | 771528 |
| 14 | 1506036 |
| 15 | 2879688 |
| 16 | 5403628 |
| 17 | 9966408 |
| 18 | 18092599 |
| 19 | 32366288 |
| 20 | 57117660 |
| 21 | 99526362 |
| 22 | 171378512 |
| 23 | 291841464 |
| 24 | 491812740 |
| 25 | 820684904 |
| 26 | 1356794820 |
| 27 | 2223458146 |
| 28 | 3613417008 |
| 29 | 5825889936 |
[1,8,36,130,412,1176,3105,7712,18192,41098,89476, 188592,386322,771528,1506036,2879688,5403628, 9966408,18092599,32366288,57117660,99526362, 171378512,291841464,491812740,820684904, 1356794820,2223458146,3613417008,5825889936] |