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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 26 |
| 5 | 97 |
| 6 | 361 |
| 7 | 1399 |
| 8 | 5532 |
| 9 | 22318 |
| 10 | 91387 |
| 11 | 379037 |
| 12 | 1588769 |
| 13 | 6720065 |
| 14 | 28645624 |
| 15 | 122937300 |
| 16 | 530748439 |
| 17 | 2303446566 |
| 18 | 10043922651 |
| 19 | 43979954296 |
| 20 | 193309569331 |
| 21 | 852599816069 |
| 22 | 3772220833468 |
| 23 | 16737583785420 |
| 24 | 74461239372631 |
| 25 | 332062396407641 |
| 26 | 1484162266154404 |
[1,1,2,8,26,97,361,1399,5532,22318,91387,379037, 1588769,6720065,28645624,122937300,530748439, 2303446566,10043922651,43979954296,193309569331, 852599816069,3772220833468,16737583785420, 74461239372631,332062396407641,1484162266154404] |