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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 4 |
| 3 | 14 |
| 4 | 17 |
| 5 | 63 |
| 6 | 72 |
| 7 | 252 |
| 8 | 266 |
| 9 | 991 |
| 10 | 1184 |
| 11 | 4080 |
| 12 | 4232 |
| 13 | 15868 |
| 14 | 18962 |
| 15 | 65343 |
| 16 | 67776 |
| 17 | 253216 |
| 18 | 306160 |
| 19 | 1047560 |
| 20 | 1083932 |
| 21 | 4054946 |
| 22 | 4858487 |
| 23 | 16742312 |
| 24 | 17336444 |
| 25 | 64871610 |
| 26 | 78293959 |
| 27 | 268434730 |
| 28 | 277777407 |
| 29 | 1037163630 |
| 30 | 1245358737 |
| 31 | 4283957243 |
| 32 | 4445604900 |
[1,3,4,14,17,63,72,252,266,991,1184,4080,4232, 15868,18962,65343,67776,253216,306160,1047560, 1083932,4054946,4858487,16742312,17336444, 64871610,78293959,268434730,277777407,1037163630, 1245358737,4283957243,4445604900] |