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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 34 |
| 3 | 98 |
| 4 | 284 |
| 5 | 826 |
| 6 | 2408 |
| 7 | 7032 |
| 8 | 20562 |
| 9 | 60186 |
| 10 | 176312 |
| 11 | 516844 |
| 12 | 1515926 |
| 13 | 4448336 |
| 14 | 13058280 |
| 15 | 38345702 |
| 16 | 112633540 |
| 17 | 330918226 |
| 18 | 972433832 |
| 19 | 2858069380 |
| 20 | 8401323984 |
| 21 | 24698783724 |
| 22 | 72618671844 |
| 23 | 213530132914 |
| 24 | 627917268794 |
[1,12,34,98,284,826,2408,7032,20562,60186,176312, 516844,1515926,4448336,13058280,38345702, 112633540,330918226,972433832,2858069380, 8401323984,24698783724,72618671844,213530132914, 627917268794] |