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A149266 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 40 |
| 5 | 145 |
| 6 | 557 |
| 7 | 2204 |
| 8 | 8878 |
| 9 | 36670 |
| 10 | 153158 |
| 11 | 649421 |
| 12 | 2779083 |
| 13 | 12009927 |
| 14 | 52301065 |
| 15 | 229322103 |
| 16 | 1011602788 |
| 17 | 4485941698 |
| 18 | 19989047298 |
| 19 | 89445085086 |
| 20 | 401786301272 |
| 21 | 1811068535817 |
| 22 | 8189394966213 |
| 23 | 37138317913733 |
| 24 | 168865708226573 |
| 25 | 769695000793202 |
| 26 | 3516190063129191 |
| 27 | 16096483440690982 |
[1,1,4,11,40,145,557,2204,8878,36670,153158, 649421,2779083,12009927,52301065,229322103, 1011602788,4485941698,19989047298,89445085086, 401786301272,1811068535817,8189394966213, 37138317913733,168865708226573,769695000793202, 3516190063129191,16096483440690982] |