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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 2 |
| 3 | 16 |
| 4 | 5 |
| 5 | 32 |
| 6 | 22 |
| 7 | 72 |
| 8 | 101 |
| 9 | 216 |
| 10 | 486 |
| 11 | 968 |
| 12 | 2541 |
| 13 | 5598 |
| 14 | 14718 |
| 15 | 35506 |
| 16 | 91947 |
| 17 | 231984 |
| 18 | 597758 |
| 19 | 1533828 |
| 20 | 3954067 |
| 21 | 10201602 |
| 22 | 26336704 |
| 23 | 68062810 |
| 24 | 175893407 |
| 25 | 454813604 |
| 26 | 1176002162 |
| 27 | 3041473404 |
| 28 | 7866219629 |
| 29 | 20346282584 |
| 30 | 52627527962 |
| 31 | 136129978706 |
[4,2,16,5,32,22,72,101,216,486,968,2541,5598, 14718,35506,91947,231984,597758,1533828,3954067, 10201602,26336704,68062810,175893407,454813604, 1176002162,3041473404,7866219629,20346282584, 52627527962,136129978706] |