A096543 Formed from a secondary diagonal of triangle A096542 where a(n) = A096542(n,n-2)/3.
0, 0, 0, 5, 188, 5560, 159460, 4715480, 147031080, 4874069760, 172184044920, 6479888595840, 259376627795780, 11019372206402560, 495710267052627900, 23556524839760174080, 1179771865401761781520, 62133101833103144386560
Offset: 0