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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 14 |
| 3 | 67 |
| 4 | 366 |
| 5 | 1840 |
| 6 | 9361 |
| 7 | 47610 |
| 8 | 242254 |
| 9 | 1234052 |
| 10 | 6286646 |
| 11 | 32024913 |
| 12 | 163120939 |
| 13 | 830844663 |
| 14 | 4231926412 |
| 15 | 21555688607 |
| 16 | 109796116924 |
| 17 | 559256572765 |
| 18 | 2848618914380 |
| 19 | 14509668521473 |
| 20 | 73906186682768 |
| 21 | 376447321305343 |
[2,14,67,366,1840,9361,47610,242254,1234052, 6286646,32024913,163120939,830844663,4231926412, 21555688607,109796116924,559256572765, 2848618914380,14509668521473,73906186682768, 376447321305343] |