Timeline for Expression for summation involving factorial
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 6, 2016 at 14:30 | comment | added | Todd Trimble | Useful summary here: oeis.org/wiki/Subfactorial. | |
| Jun 6, 2016 at 12:13 | comment | added | Peter Kravchuk | $\sum_{k=0}^n C_n^k k!=\int_0^\infty C_n^k x^k e^{-x}dx=\int_0^\infty (1+x)^n e^{-x}dx$ expressible via the incomplete Gamma function | |
| Jun 6, 2016 at 12:13 | answer | added | Jeffrey Shallit | timeline score: 8 | |
| Jun 6, 2016 at 12:05 | history | asked | Arun Sen | CC BY-SA 3.0 |