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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 20 |
| 3 | 1096 |
| 4 | 2981 |
| 5 | 59874 |
| 6 | 442413 |
| 7 | 8886110 |
| 8 | 65659969 |
| 9 | 178482301 |
| 10 | 3584912846 |
| 11 | 26489122130 |
| 12 | 195729609429 |
| 13 | 3931334297144 |
| 14 | 78962960182680 |
| 15 | 214643579785916 |
| 16 | 4311231547115195 |
| 17 | 31855931757113756 |
| 18 | 86593400423993747 |
| 19 | 12851600114359308275 |
| 20 | 34934271057485095348 |
[3,20,1096,2981,59874,442413,8886110,65659969, 178482301,3584912846,26489122130,195729609429, 3931334297144,78962960182680,214643579785916, 4311231547115195,31855931757113756, 86593400423993747,12851600114359308275, 34934271057485095348] |