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) |
|---|---|
| 0 | 0 |
| 1 | -1 |
| 2 | -3 |
| 3 | -6 |
| 4 | -10 |
| 5 | -15 |
| 6 | -21 |
| 7 | -28 |
| 8 | -36 |
| 9 | -45 |
| 10 | -45 |
| 11 | -44 |
| 12 | -42 |
| 13 | -39 |
| 14 | -35 |
| 15 | -30 |
| 16 | -24 |
| 17 | -17 |
| 18 | -9 |
| 19 | 0 |
| 20 | 0 |
| 21 | 2 |
| 22 | 6 |
| 23 | 12 |
| 24 | 20 |
| 25 | 30 |
| 26 | 42 |
| 27 | 56 |
| 28 | 72 |
| 29 | 90 |
| 30 | 90 |
| 31 | 93 |
| 32 | 99 |
| 33 | 108 |
| 34 | 120 |
| 35 | 135 |
| 36 | 153 |
| 37 | 174 |
| 38 | 198 |
| 39 | 225 |
| 40 | 225 |
| 41 | 229 |
| 42 | 237 |
| 43 | 249 |
| 44 | 265 |
| 45 | 285 |
| 46 | 309 |
| 47 | 337 |
| 48 | 369 |
| 49 | 405 |
| 50 | 405 |
| 51 | 410 |
| 52 | 420 |
| 53 | 435 |
| 54 | 455 |
| 55 | 480 |
| 56 | 510 |
| 57 | 545 |
| 58 | 585 |
| 59 | 630 |
| 60 | 630 |
| 61 | 636 |
| 62 | 648 |
| 63 | 666 |
[0,-1,-3,-6,-10,-15,-21,-28,-36,-45,-45,-44,-42, -39,-35,-30,-24,-17,-9,0,0,2,6,12,20,30,42,56,72, 90,90,93,99,108,120,135,153,174,198,225,225,229, 237,249,265,285,309,337,369,405,405,410,420,435, 455,480,510,545,585,630,630,636,648,666] |