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A180322 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 15 |
| 6 | 21 |
| 7 | 49 |
| 8 | 72 |
| 9 | 126 |
| 10 | 195 |
| 11 | 341 |
| 12 | 486 |
| 13 | 819 |
| 14 | 1225 |
| 15 | 1845 |
| 16 | 2880 |
| 17 | 4335 |
| 18 | 6552 |
| 19 | 9709 |
| 20 | 14850 |
| 21 | 21315 |
| 22 | 33077 |
| 23 | 47081 |
| 24 | 72360 |
| 25 | 102300 |
| 26 | 158067 |
| 27 | 220752 |
| 28 | 341334 |
| 29 | 475107 |
| 30 | 732735 |
| 31 | 1015777 |
| 32 | 1566720 |
| 33 | 2161599 |
| 34 | 3333615 |
| 35 | 4587135 |
| 36 | 7062552 |
| 37 | 9699291 |
| 38 | 14922733 |
| 39 | 20444697 |
[1,1,3,6,15,21,49,72,126,195,341,486,819,1225, 1845,2880,4335,6552,9709,14850,21315,33077,47081, 72360,102300,158067,220752,341334,475107,732735, 1015777,1566720,2161599,3333615,4587135,7062552, 9699291,14922733,20444697] |