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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 26 |
| 4 | 107 |
| 5 | 462 |
| 6 | 2053 |
| 7 | 9357 |
| 8 | 43312 |
| 9 | 203180 |
| 10 | 962555 |
| 11 | 4596511 |
| 12 | 22091572 |
| 13 | 106733036 |
| 14 | 517927304 |
| 15 | 2522423944 |
| 16 | 12322749650 |
| 17 | 60357919187 |
| 18 | 296304581671 |
| 19 | 1457419770252 |
| 20 | 7180626570463 |
| 21 | 35430558631116 |
| 22 | 175046219852421 |
| 23 | 865804309015437 |
| 24 | 4286686560241754 |
| 25 | 21242694102354515 |
| 26 | 105351540746353992 |
[1,2,7,26,107,462,2053,9357,43312,203180,962555, 4596511,22091572,106733036,517927304,2522423944, 12322749650,60357919187,296304581671, 1457419770252,7180626570463,35430558631116, 175046219852421,865804309015437,4286686560241754, 21242694102354515,105351540746353992] |