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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 15 |
| 4 | 69 |
| 5 | 261 |
| 6 | 1189 |
| 7 | 4997 |
| 8 | 23011 |
| 9 | 101409 |
| 10 | 474129 |
| 11 | 2142413 |
| 12 | 10136447 |
| 13 | 46598031 |
| 14 | 222214471 |
| 15 | 1035157901 |
| 16 | 4963828023 |
| 17 | 23358551315 |
| 18 | 112507014881 |
| 19 | 533522375907 |
| 20 | 2579300250923 |
| 21 | 12305507331249 |
| 22 | 59674791214175 |
| 23 | 286107311964209 |
| 24 | 1391007954838179 |
| 25 | 6696550282875709 |
| 26 | 32627566832532271 |
| 27 | 157617888654022555 |
[1,1,5,15,69,261,1189,4997,23011,101409,474129, 2142413,10136447,46598031,222214471,1035157901, 4963828023,23358551315,112507014881,533522375907, 2579300250923,12305507331249,59674791214175, 286107311964209,1391007954838179,6696550282875709, 32627566832532271,157617888654022555] |