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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 94 |
| 5 | 365 |
| 6 | 1522 |
| 7 | 6317 |
| 8 | 27305 |
| 9 | 117730 |
| 10 | 521284 |
| 11 | 2305176 |
| 12 | 10382686 |
| 13 | 46739971 |
| 14 | 213238207 |
| 15 | 972787925 |
| 16 | 4482614090 |
| 17 | 20660903549 |
| 18 | 95970758823 |
| 19 | 445977751724 |
| 20 | 2085227368751 |
| 21 | 9754995754038 |
| 22 | 45861516294520 |
| 23 | 215740410214838 |
| 24 | 1018995605536144 |
| 25 | 4816034636508802 |
| 26 | 22838382322351173 |
| 27 | 108373516882028634 |
[1,2,7,24,94,365,1522,6317,27305,117730,521284, 2305176,10382686,46739971,213238207,972787925, 4482614090,20660903549,95970758823,445977751724, 2085227368751,9754995754038,45861516294520, 215740410214838,1018995605536144,4816034636508802, 22838382322351173,108373516882028634] |