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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 39 |
| 4 | 156 |
| 5 | 656 |
| 6 | 2843 |
| 7 | 12506 |
| 8 | 56183 |
| 9 | 254799 |
| 10 | 1167999 |
| 11 | 5400258 |
| 12 | 25116348 |
| 13 | 117576380 |
| 14 | 552896051 |
| 15 | 2611402749 |
| 16 | 12381025083 |
| 17 | 58885700834 |
| 18 | 280918838846 |
| 19 | 1343547473970 |
| 20 | 6440935983886 |
| 21 | 30943137348073 |
| 22 | 148936555890019 |
| 23 | 718126779191896 |
| 24 | 3468065435753711 |
| 25 | 16772888745124827 |
| 26 | 81229159839429236 |
[1,3,10,39,156,656,2843,12506,56183,254799, 1167999,5400258,25116348,117576380,552896051, 2611402749,12381025083,58885700834,280918838846, 1343547473970,6440935983886,30943137348073, 148936555890019,718126779191896,3468065435753711, 16772888745124827,81229159839429236] |