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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 114 |
| 5 | 240 |
| 6 | 2238 |
| 7 | 216318 |
| 8 | 5622392 |
| 9 | 20454036 |
| 10 | 970623228 |
| 11 | 1038614548176 |
| 12 | 131929454285752 |
| 13 | 1257138602103744 |
| 14 | 316487245419538728 |
| 15 | 3147612978951707912144 |
| 16 | 2069163709506683013857472 |
| 17 | 63184698521304672890081520 |
| 18 | 85953148896748583125564477008 |
[1,3,17,114,240,2238,216318,5622392,20454036, 970623228,1038614548176,131929454285752, 1257138602103744,316487245419538728, 3147612978951707912144,2069163709506683013857472, 63184698521304672890081520, 85953148896748583125564477008] |