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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 9 |
| 3 | 114 |
| 4 | 908 |
| 5 | 5985 |
| 6 | 35505 |
| 7 | 196602 |
| 8 | 1036992 |
| 9 | 5277357 |
| 10 | 26134385 |
| 11 | 126677826 |
| 12 | 603492444 |
| 13 | 2834183937 |
| 14 | 13150592889 |
| 15 | 60391598610 |
| 16 | 274863240992 |
| 17 | 1241212143357 |
| 18 | 5566202141193 |
| 19 | 24807561785514 |
| 20 | 109950785325900 |
| 21 | 484883791129185 |
| 22 | 2128652665933409 |
| 23 | 9306262365861834 |
[0,9,114,908,5985,35505,196602,1036992,5277357, 26134385,126677826,603492444,2834183937, 13150592889,60391598610,274863240992, 1241212143357,5566202141193,24807561785514, 109950785325900,484883791129185,2128652665933409, 9306262365861834] |