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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 868 |
| 3 | 13890 |
| 4 | 104268 |
| 5 | 464782 |
| 6 | 1577040 |
| 7 | 4310382 |
| 8 | 10274388 |
| 9 | 21921086 |
| 10 | 43069520 |
| 11 | 78878810 |
| 12 | 137045852 |
| 13 | 226914998 |
| 14 | 361712248 |
| 15 | 557412114 |
| 16 | 834701940 |
| 17 | 1217933582 |
| 18 | 1739046456 |
| 19 | 2432877362 |
| 20 | 3344664408 |
| 21 | 4524523614 |
| 22 | 6033558944 |
| 23 | 7938870746 |
[2,868,13890,104268,464782,1577040,4310382, 10274388,21921086,43069520,78878810,137045852, 226914998,361712248,557412114,834701940, 1217933582,1739046456,2432877362,3344664408, 4524523614,6033558944,7938870746] |