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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 10 |
| 3 | 55 |
| 4 | 220 |
| 5 | 715 |
| 6 | 2002 |
| 7 | 5005 |
| 8 | 11440 |
| 9 | 24310 |
| 10 | 48619 |
| 11 | 92359 |
| 12 | 167815 |
| 13 | 293215 |
| 14 | 494725 |
| 15 | 808753 |
| 16 | 1284481 |
| 17 | 1986490 |
| 18 | 2997280 |
| 19 | 4419415 |
| 20 | 6376951 |
| 21 | 9015769 |
| 22 | 12502435 |
| 23 | 17021245 |
| 24 | 22769185 |
| 25 | 29948644 |
| 26 | 38757862 |
| 27 | 49379275 |
| 28 | 61966135 |
| 29 | 76628035 |
| 30 | 93416221 |
| 31 | 112309741 |
| 32 | 133203565 |
| 33 | 155899810 |
| 34 | 180103120 |
[1,10,55,220,715,2002,5005,11440,24310,48619, 92359,167815,293215,494725,808753,1284481,1986490, 2997280,4419415,6376951,9015769,12502435,17021245, 22769185,29948644,38757862,49379275,61966135, 76628035,93416221,112309741,133203565,155899810, 180103120] |