The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 15 |
| 4 | 30 |
| 5 | 70 |
| 6 | 105 |
| 7 | 210 |
| 8 | 462 |
| 9 | 770 |
| 10 | 1155 |
| 11 | 2145 |
| 12 | 2310 |
| 13 | 4290 |
| 14 | 6006 |
| 15 | 9282 |
| 16 | 10010 |
| 17 | 15015 |
| 18 | 23205 |
| 19 | 30030 |
| 20 | 46410 |
| 21 | 67830 |
| 22 | 72930 |
| 23 | 102102 |
| 24 | 149226 |
| 25 | 170170 |
| 26 | 248710 |
| 27 | 255255 |
| 28 | 373065 |
| 29 | 440895 |
| 30 | 510510 |
| 31 | 746130 |
| 32 | 881790 |
| 33 | 1193010 |
| 34 | 1385670 |
| 35 | 1874730 |
| 36 | 1939938 |
| 37 | 2624622 |
| 38 | 3233230 |
[1,6,15,30,70,105,210,462,770,1155,2145,2310,4290, 6006,9282,10010,15015,23205,30030,46410,67830, 72930,102102,149226,170170,248710,255255,373065, 440895,510510,746130,881790,1193010,1385670, 1874730,1939938,2624622,3233230] |