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 |
| 0 | 0 |
| 1 | 2 |
| 2 | -3 |
| 3 | 4 |
| 4 | -6 |
| 5 | 9 |
| 6 | -12 |
| 7 | 16 |
| 8 | -21 |
| 9 | 28 |
| 10 | -36 |
| 11 | 47 |
| 12 | -60 |
| 13 | 76 |
| 14 | -96 |
| 15 | 120 |
| 16 | -150 |
| 17 | 185 |
| 18 | -228 |
| 19 | 280 |
| 20 | -342 |
| 21 | 416 |
| 22 | -504 |
| 23 | 608 |
| 24 | -732 |
| 25 | 878 |
| 26 | -1050 |
| 27 | 1252 |
| 28 | -1488 |
| 29 | 1765 |
| 30 | -2088 |
| 31 | 2464 |
| 32 | -2901 |
| 33 | 3408 |
| 34 | -3996 |
| 35 | 4676 |
| 36 | -5460 |
| 37 | 6364 |
| 38 | -7404 |
| 39 | 8600 |
| 40 | -9972 |
| 41 | 11545 |
| 42 | -13344 |
| 43 | 15400 |
| 44 | -17748 |
| 45 | 20424 |
[1,0,2,-3,4,-6,9,-12,16,-21,28,-36,47,-60,76,-96, 120,-150,185,-228,280,-342,416,-504,608,-732,878, -1050,1252,-1488,1765,-2088,2464,-2901,3408,-3996, 4676,-5460,6364,-7404,8600,-9972,11545,-13344, 15400,-17748,20424] |