I would like to ask if G is a group of order $p^4 (p\neq 2)$ as form $C_{p^3}\rtimes C_p$ (a semidirect product of cyclic group of order $p^3$ by a group of order $p$). Then can we obtain the first co-homology $H^1(C_p,C_{p^3} )$? Is there any upper bound on the order of $H^1(C_p, C_{p^3})$?
yours,