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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 6 |
| 6 | 9 |
| 7 | 21 |
| 8 | 30 |
| 9 | 70 |
| 10 | 100 |
| 11 | 235 |
| 12 | 335 |
| 13 | 791 |
| 14 | 1127 |
| 15 | 2681 |
| 16 | 3822 |
| 17 | 9150 |
| 18 | 13050 |
| 19 | 31401 |
| 20 | 44802 |
| 21 | 108262 |
| 22 | 154517 |
| 23 | 374715 |
| 24 | 534963 |
| 25 | 1301235 |
| 26 | 1858155 |
| 27 | 4531423 |
| 28 | 6472167 |
| 29 | 15818791 |
| 30 | 22597759 |
| 31 | 55339849 |
| 32 | 79067374 |
| 33 | 193962894 |
| 34 | 277164294 |
| 35 | 680963509 |
| 36 | 973184312 |
| 37 | 2394289028 |
| 38 | 3422117189 |
[0,0,1,2,6,9,21,30,70,100,235,335,791,1127,2681, 3822,9150,13050,31401,44802,108262,154517,374715, 534963,1301235,1858155,4531423,6472167,15818791, 22597759,55339849,79067374,193962894,277164294, 680963509,973184312,2394289028,3422117189] |