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| n | a(n) |
|---|---|
| 1 | 22 |
| 2 | 120 |
| 3 | 431 |
| 4 | 1760 |
| 5 | 7452 |
| 6 | 30882 |
| 7 | 126098 |
| 8 | 511108 |
| 9 | 2063052 |
| 10 | 8301984 |
| 11 | 33334755 |
| 12 | 133657996 |
| 13 | 535440240 |
| 14 | 2143822408 |
| 15 | 8580556159 |
| 16 | 34335672876 |
| 17 | 137377037835 |
| 18 | 549596067402 |
| 19 | 2198610089868 |
| 20 | 8795022257168 |
| 21 | 35181592140181 |
| 22 | 140730259104058 |
[22,120,431,1760,7452,30882,126098,511108,2063052, 8301984,33334755,133657996,535440240,2143822408, 8580556159,34335672876,137377037835,549596067402, 2198610089868,8795022257168,35181592140181, 140730259104058] |