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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 4 |
| 6 | 10 |
| 7 | 20 |
| 8 | 40 |
| 9 | 70 |
| 10 | 112 |
| 11 | 168 |
| 12 | 252 |
| 13 | 360 |
| 14 | 495 |
| 15 | 661 |
| 16 | 881 |
| 17 | 1145 |
| 18 | 1457 |
| 19 | 1824 |
| 20 | 2279 |
| 21 | 2804 |
| 22 | 3404 |
| 23 | 4090 |
| 24 | 4906 |
| 25 | 5824 |
| 26 | 6850 |
| 27 | 8000 |
| 28 | 9330 |
| 29 | 10800 |
| 30 | 12417 |
| 31 | 14208 |
| 32 | 16232 |
| 33 | 18440 |
| 34 | 20840 |
| 35 | 23470 |
| 36 | 26395 |
| 37 | 29554 |
| 38 | 32956 |
| 39 | 36652 |
| 40 | 40712 |
| 41 | 45062 |
| 42 | 49712 |
| 43 | 54728 |
| 44 | 60184 |
[0,0,0,1,4,10,20,40,70,112,168,252,360,495,661, 881,1145,1457,1824,2279,2804,3404,4090,4906,5824, 6850,8000,9330,10800,12417,14208,16232,18440, 20840,23470,26395,29554,32956,36652,40712,45062, 49712,54728,60184] |