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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 5 |
| 3 | 14 |
| 4 | 33 |
| 5 | 47 |
| 6 | 221 |
| 7 | 6235 |
| 8 | 25161 |
| 9 | 31396 |
| 10 | 87953 |
| 11 | 207302 |
| 12 | 295255 |
| 13 | 1388322 |
| 14 | 39168271 |
| 15 | 158061406 |
| 16 | 197229677 |
| 17 | 552520760 |
| 18 | 1302271197 |
| 19 | 1854791957 |
| 20 | 8721439025 |
| 21 | 246055084657 |
| 22 | 992941777653 |
| 23 | 1238996862310 |
| 24 | 3470935502273 |
| 25 | 8180867866856 |
| 26 | 11651803369129 |
[1,4,5,14,33,47,221,6235,25161,31396,87953,207302, 295255,1388322,39168271,158061406,197229677, 552520760,1302271197,1854791957,8721439025, 246055084657,992941777653,1238996862310, 3470935502273,8180867866856,11651803369129] |