Number of jumps in all even trees with 2n edges.

Terms

a(0) =0a(1) =1a(2) =9a(3) =65a(4) =442a(5) =2940a(6) =19380a(7) =127281a(8) =834900a(9) =5476185a(10) =35937525a(11) =236030652a(12) =1551652424a(13) =10210456360a(14) =67254204696a(15) =443410005585