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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 39 |
| 5 | 108 |
| 6 | 298 |
| 7 | 824 |
| 8 | 2278 |
| 9 | 6298 |
| 10 | 17412 |
| 11 | 48138 |
| 12 | 133085 |
| 13 | 367934 |
| 14 | 1017212 |
| 15 | 2812240 |
| 16 | 7774875 |
| 17 | 21494854 |
| 18 | 59425870 |
| 19 | 164292072 |
| 20 | 454211016 |
| 21 | 1255737086 |
| 22 | 3471680722 |
| 23 | 9598001976 |
| 24 | 26535171097 |
| 25 | 73360612640 |
| 26 | 202816837599 |
| 27 | 560718730852 |
| 28 | 1550194248403 |
| 29 | 4285753401052 |
[1,2,5,14,39,108,298,824,2278,6298,17412,48138, 133085,367934,1017212,2812240,7774875,21494854, 59425870,164292072,454211016,1255737086, 3471680722,9598001976,26535171097,73360612640, 202816837599,560718730852,1550194248403, 4285753401052] |