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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 22 |
| 4 | 67 |
| 5 | 202 |
| 6 | 607 |
| 7 | 1822 |
| 8 | 5467 |
| 9 | 16402 |
| 10 | 49207 |
| 11 | 147622 |
| 12 | 442867 |
| 13 | 1328602 |
| 14 | 3985807 |
| 15 | 11957422 |
| 16 | 35872267 |
| 17 | 107616802 |
| 18 | 322850407 |
| 19 | 968551222 |
| 20 | 2905653667 |
| 21 | 8716961002 |
| 22 | 26150883007 |
| 23 | 78452649022 |
| 24 | 235357947067 |
| 25 | 706073841202 |
[1,2,7,22,67,202,607,1822,5467,16402,49207,147622, 442867,1328602,3985807,11957422,35872267, 107616802,322850407,968551222,2905653667, 8716961002,26150883007,78452649022,235357947067, 706073841202] |