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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 44 |
| 5 | 142 |
| 6 | 648 |
| 7 | 2346 |
| 8 | 10929 |
| 9 | 41996 |
| 10 | 198400 |
| 11 | 790809 |
| 12 | 3772937 |
| 13 | 15423184 |
| 14 | 74122058 |
| 15 | 308698810 |
| 16 | 1491917931 |
| 17 | 6303461720 |
| 18 | 30598038823 |
| 19 | 130770863783 |
| 20 | 636981609747 |
| 21 | 2748036278509 |
| 22 | 13422579735590 |
| 23 | 58363260029680 |
| 24 | 285708746598083 |
| 25 | 1250618636818368 |
| 26 | 6133514881151521 |
| 27 | 27002871070397109 |
[1,1,4,10,44,142,648,2346,10929,41996,198400, 790809,3772937,15423184,74122058,308698810, 1491917931,6303461720,30598038823,130770863783, 636981609747,2748036278509,13422579735590, 58363260029680,285708746598083,1250618636818368, 6133514881151521,27002871070397109] |