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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 15 |
| 3 | 42 |
| 4 | 101 |
| 5 | 231 |
| 6 | 490 |
| 7 | 1002 |
| 8 | 1958 |
| 9 | 3718 |
| 10 | 6842 |
| 11 | 12310 |
| 12 | 21637 |
| 13 | 37338 |
| 14 | 63261 |
| 15 | 105558 |
| 16 | 173525 |
| 17 | 281589 |
| 18 | 451276 |
| 19 | 715220 |
| 20 | 1121505 |
| 21 | 1741630 |
| 22 | 2679689 |
| 23 | 4087968 |
| 24 | 6185689 |
| 25 | 9289091 |
| 26 | 13848650 |
| 27 | 20506255 |
| 28 | 30167357 |
| 29 | 44108109 |
| 30 | 64112359 |
| 31 | 92669720 |
| 32 | 133230930 |
| 33 | 190569292 |
[1,5,15,42,101,231,490,1002,1958,3718,6842,12310, 21637,37338,63261,105558,173525,281589,451276, 715220,1121505,1741630,2679689,4087968,6185689, 9289091,13848650,20506255,30167357,44108109, 64112359,92669720,133230930,190569292] |