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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 46 |
| 5 | 163 |
| 6 | 604 |
| 7 | 2312 |
| 8 | 9096 |
| 9 | 36618 |
| 10 | 150109 |
| 11 | 624637 |
| 12 | 2632371 |
| 13 | 11214343 |
| 14 | 48222612 |
| 15 | 209038216 |
| 16 | 912561043 |
| 17 | 4008715175 |
| 18 | 17707364850 |
| 19 | 78605026891 |
| 20 | 350490038669 |
| 21 | 1569073486654 |
| 22 | 7050036268911 |
| 23 | 31781800472145 |
| 24 | 143708009436873 |
| 25 | 651613553588894 |
| 26 | 2962168943627220 |
| 27 | 13497542814094082 |
[1,2,5,14,46,163,604,2312,9096,36618,150109, 624637,2632371,11214343,48222612,209038216, 912561043,4008715175,17707364850,78605026891, 350490038669,1569073486654,7050036268911, 31781800472145,143708009436873,651613553588894, 2962168943627220,13497542814094082] |