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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 22 |
| 3 | 194 |
| 4 | 2103 |
| 5 | 25129 |
| 6 | 318816 |
| 7 | 4214724 |
| 8 | 57419725 |
| 9 | 800461033 |
| 10 | 11363418314 |
| 11 | 163708299724 |
| 12 | 2387365301187 |
| 13 | 35173224652637 |
| 14 | 522752043513952 |
| 15 | 7827979832083872 |
| 16 | 117992516684761733 |
| 17 | 1788819120580964014 |
| 18 | 27258417705055812586 |
| 19 | 417270970443908301926 |
[1,4,22,194,2103,25129,318816,4214724,57419725, 800461033,11363418314,163708299724,2387365301187, 35173224652637,522752043513952,7827979832083872, 117992516684761733,1788819120580964014, 27258417705055812586,417270970443908301926] |