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| n | a(n) |
|---|---|
| 1 | 42 |
| 2 | 240 |
| 3 | 916 |
| 4 | 3748 |
| 5 | 14960 |
| 6 | 62104 |
| 7 | 248176 |
| 8 | 969304 |
| 9 | 3876576 |
| 10 | 15962544 |
| 11 | 63772488 |
| 12 | 248169896 |
| 13 | 993554240 |
| 14 | 4086635408 |
| 15 | 16350541128 |
| 16 | 63529835824 |
| 17 | 254129143040 |
| 18 | 1046249323840 |
| 19 | 4184725760584 |
| 20 | 16276030608712 |
| 21 | 65054467548432 |
| 22 | 267635134298624 |
[42,240,916,3748,14960,62104,248176,969304, 3876576,15962544,63772488,248169896,993554240, 4086635408,16350541128,63529835824,254129143040, 1046249323840,4184725760584,16276030608712, 65054467548432,267635134298624] |