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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 7 |
| 3 | 36 |
| 4 | 181 |
| 5 | 788 |
| 6 | 3395 |
| 7 | 14416 |
| 8 | 60287 |
| 9 | 248730 |
| 10 | 1015441 |
| 11 | 4114586 |
| 12 | 16589297 |
| 13 | 66672856 |
| 14 | 267436439 |
| 15 | 1071475836 |
| 16 | 4289870299 |
| 17 | 17168484878 |
| 18 | 68694203765 |
| 19 | 274822100086 |
| 20 | 1099388981117 |
| 21 | 4397778120444 |
| 22 | 17591600993131 |
| 23 | 70367473368392 |
| 24 | 281472225324311 |
| 25 | 1125893967799138 |
[3,7,36,181,788,3395,14416,60287,248730,1015441, 4114586,16589297,66672856,267436439,1071475836, 4289870299,17168484878,68694203765,274822100086, 1099388981117,4397778120444,17591600993131, 70367473368392,281472225324311,1125893967799138] |