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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 36 |
| 5 | 102 |
| 6 | 313 |
| 7 | 994 |
| 8 | 3318 |
| 9 | 11536 |
| 10 | 41748 |
| 11 | 156735 |
| 12 | 609973 |
| 13 | 2456235 |
| 14 | 10224216 |
| 15 | 43946245 |
| 16 | 194866898 |
| 17 | 890575047 |
| 18 | 4190997666 |
| 19 | 20289434813 |
| 20 | 100952490046 |
| 21 | 515758568587 |
| 22 | 2703023502100 |
| 23 | 14518677321040 |
| 24 | 79852871813827 |
| 25 | 449333028779385 |
| 26 | 2584677513933282 |
[1,2,5,13,36,102,313,994,3318,11536,41748,156735, 609973,2456235,10224216,43946245,194866898, 890575047,4190997666,20289434813,100952490046, 515758568587,2703023502100,14518677321040, 79852871813827,449333028779385,2584677513933282] |