a(n) = 2*(2n)^(n-2).A097629a(n) = 2*(2n)^(n-2).Terms a(0) =1a(1) =2a(2) =12a(3) =128a(4) =2000a(5) =41472a(6) =1075648a(7) =33554432a(8) =1224440064a(9) =51200000000External referencesoeis: A097629