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 | 1 |
| 1 | 20 |
| 2 | 200 |
| 3 | 1360 |
| 4 | 7200 |
| 5 | 32024 |
| 6 | 125280 |
| 7 | 443680 |
| 8 | 1450240 |
| 9 | 4435940 |
| 10 | 12827888 |
| 11 | 35346800 |
| 12 | 93377920 |
| 13 | 237675640 |
| 14 | 585229760 |
| 15 | 1398704736 |
| 16 | 3253934080 |
| 17 | 7386124520 |
| 18 | 16392493800 |
| 19 | 35634450320 |
| 20 | 75992326592 |
| 21 | 159199081600 |
| 22 | 328027789600 |
[1,20,200,1360,7200,32024,125280,443680,1450240, 4435940,12827888,35346800,93377920,237675640, 585229760,1398704736,3253934080,7386124520, 16392493800,35634450320,75992326592,159199081600, 328027789600] |