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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 22 |
| 3 | 92 |
| 4 | 373 |
| 5 | 1482 |
| 6 | 5810 |
| 7 | 22576 |
| 8 | 87210 |
| 9 | 335597 |
| 10 | 1288276 |
| 11 | 4938100 |
| 12 | 18913245 |
| 13 | 72416190 |
| 14 | 277278570 |
| 15 | 1061970720 |
| 16 | 4069098750 |
| 17 | 15600014370 |
| 18 | 59845059924 |
| 19 | 229737429048 |
| 20 | 882572168450 |
| 21 | 3393064828340 |
| 22 | 13054529476852 |
| 23 | 50264063289888 |
[1,5,22,92,373,1482,5810,22576,87210,335597, 1288276,4938100,18913245,72416190,277278570, 1061970720,4069098750,15600014370,59845059924, 229737429048,882572168450,3393064828340, 13054529476852,50264063289888] |