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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 16 |
| 3 | 36 |
| 4 | 92 |
| 5 | 236 |
| 6 | 622 |
| 7 | 1658 |
| 8 | 4468 |
| 9 | 12132 |
| 10 | 33146 |
| 11 | 90998 |
| 12 | 250802 |
| 13 | 693426 |
| 14 | 1922118 |
| 15 | 5339006 |
| 16 | 14854932 |
| 17 | 41387764 |
| 18 | 115438672 |
| 19 | 322267784 |
| 20 | 900314242 |
| 21 | 2516648618 |
| 22 | 7038066876 |
| 23 | 19690060024 |
| 24 | 55102545322 |
| 25 | 154241612986 |
[1,6,16,36,92,236,622,1658,4468,12132,33146,90998, 250802,693426,1922118,5339006,14854932,41387764, 115438672,322267784,900314242,2516648618, 7038066876,19690060024,55102545322,154241612986] |