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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 6 |
| 3 | 7 |
| 4 | 20 |
| 5 | 31 |
| 6 | 88 |
| 7 | 63 |
| 8 | 272 |
| 9 | 383 |
| 10 | 1120 |
| 11 | 1279 |
| 12 | 4160 |
| 13 | 4607 |
| 14 | 19328 |
| 15 | 23551 |
| 16 | 75008 |
| 17 | 67583 |
| 18 | 325120 |
| 19 | 307199 |
| 20 | 1213440 |
| 21 | 1220607 |
| 22 | 4896768 |
| 23 | 4964351 |
| 24 | 19550208 |
| 25 | 19431423 |
| 26 | 78602240 |
| 27 | 78839807 |
| 28 | 311967744 |
| 29 | 315228159 |
| 30 | 1249083392 |
| 31 | 1211891711 |
| 32 | 5086969856 |
| 33 | 4836556799 |
[1,1,6,7,20,31,88,63,272,383,1120,1279,4160,4607, 19328,23551,75008,67583,325120,307199,1213440, 1220607,4896768,4964351,19550208,19431423, 78602240,78839807,311967744,315228159,1249083392, 1211891711,5086969856,4836556799] |