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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 4 |
| 4 | 42 |
| 5 | 130 |
| 6 | 464 |
| 7 | 1722 |
| 8 | 6378 |
| 9 | 22939 |
| 10 | 84079 |
| 11 | 306987 |
| 12 | 1119981 |
| 13 | 4087469 |
| 14 | 14922974 |
| 15 | 54464744 |
| 16 | 198801521 |
| 17 | 725648052 |
| 18 | 2648666277 |
| 19 | 9667805493 |
| 20 | 35288299004 |
| 21 | 128804934449 |
| 22 | 470147769118 |
| 23 | 1716075418498 |
| 24 | 6263806496746 |
| 25 | 22863371318814 |
[0,5,4,42,130,464,1722,6378,22939,84079,306987, 1119981,4087469,14922974,54464744,198801521, 725648052,2648666277,9667805493,35288299004, 128804934449,470147769118,1716075418498, 6263806496746,22863371318814] |