The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 10 |
| 5 | 15 |
| 6 | 21 |
| 7 | 28 |
| 8 | 36 |
| 9 | 0 |
| 10 | 105 |
| 11 | 121 |
| 12 | 138 |
| 13 | 156 |
| 14 | 175 |
| 15 | 195 |
| 16 | 216 |
| 17 | 238 |
| 18 | 261 |
| 19 | 190 |
| 20 | 310 |
| 21 | 336 |
| 22 | 363 |
| 23 | 391 |
| 24 | 420 |
| 25 | 450 |
| 26 | 481 |
| 27 | 513 |
| 28 | 546 |
| 29 | 435 |
| 30 | 615 |
| 31 | 651 |
| 32 | 688 |
| 33 | 726 |
| 34 | 765 |
| 35 | 805 |
| 36 | 846 |
| 37 | 888 |
| 38 | 931 |
| 39 | 780 |
| 40 | 1020 |
| 41 | 1066 |
| 42 | 1113 |
| 43 | 1161 |
| 44 | 1210 |
| 45 | 1260 |
| 46 | 1311 |
| 47 | 1363 |
| 48 | 1416 |
| 49 | 1225 |
| 50 | 1525 |
| 51 | 1581 |
[1,3,6,10,15,21,28,36,0,105,121,138,156,175,195, 216,238,261,190,310,336,363,391,420,450,481,513, 546,435,615,651,688,726,765,805,846,888,931,780, 1020,1066,1113,1161,1210,1260,1311,1363,1416,1225, 1525,1581] |