Happy $1^6 3^4 5^2 7^0$

A curious progression of factors that can also be premultiplied by $(-1)^8$ and written $\prod_{k=0}^4 (2k-1)^{8-2k}$. (Others write $\bigl(\sum_{k=0}^9 k\bigr)^2$, or $\sum_{k=0}^9 k^3$.)

 
From: https://www-cs-faculty.stanford.edu/~knuth/news25.html