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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 19 |
| 4 | 55 |
| 5 | 220 |
| 6 | 793 |
| 7 | 2845 |
| 8 | 10480 |
| 9 | 37963 |
| 10 | 138259 |
| 11 | 503608 |
| 12 | 1831969 |
| 13 | 6669865 |
| 14 | 24276892 |
| 15 | 88362451 |
| 16 | 321640831 |
| 17 | 1170726484 |
| 18 | 4261339801 |
| 19 | 15510894949 |
| 20 | 56458080328 |
| 21 | 205502135851 |
| 22 | 748007984827 |
| 23 | 2722677076336 |
| 24 | 9910284168961 |
[1,1,4,19,55,220,793,2845,10480,37963,138259, 503608,1831969,6669865,24276892,88362451, 321640831,1170726484,4261339801,15510894949, 56458080328,205502135851,748007984827, 2722677076336,9910284168961] |