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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 7 |
| 4 | 17 |
| 5 | 30 |
| 6 | 136 |
| 7 | 962 |
| 8 | 1163 |
| 9 | 1261 |
| 10 | 1293 |
| 11 | 4848 |
| 12 | 25868 |
| 13 | 90630 |
| 14 | 120043 |
| 15 | 361758 |
| 16 | 461961 |
| 17 | 782264 |
| 18 | 3475705 |
| 19 | 3692283 |
| 20 | 5368321 |
| 21 | 41569140 |
| 22 | 150371793 |
| 23 | 1947926537 |
| 24 | 2754626037 |
| 25 | 3680776906 |
[0,1,7,17,30,136,962,1163,1261,1293,4848,25868, 90630,120043,361758,461961,782264,3475705,3692283, 5368321,41569140,150371793,1947926537,2754626037, 3680776906] |