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| n | a(n) |
|---|---|
| 1 | 38 |
| 2 | 150 |
| 3 | 464 |
| 4 | 1770 |
| 5 | 5680 |
| 6 | 21088 |
| 7 | 69270 |
| 8 | 252226 |
| 9 | 842160 |
| 10 | 3024532 |
| 11 | 10215894 |
| 12 | 36333498 |
| 13 | 123729784 |
| 14 | 437028516 |
| 15 | 1496890470 |
| 16 | 5261453226 |
| 17 | 18095303560 |
| 18 | 63384222948 |
| 19 | 218626027574 |
| 20 | 763932706666 |
| 21 | 2640392321080 |
| 22 | 9210217141124 |
[38,150,464,1770,5680,21088,69270,252226,842160, 3024532,10215894,36333498,123729784,437028516, 1496890470,5261453226,18095303560,63384222948, 218626027574,763932706666,2640392321080, 9210217141124] |