Number of C&C Family matchings on n edges.

Terms

a(0) =1a(1) =1a(2) =3a(3) =12a(4) =51a(5) =227a(6) =1052a(7) =5030a(8) =24634a(9) =122950a(10) =623140a(11) =3198502a(12) =16593124a(13) =86864578a(14) =458294970a(15) =2434421685a(16) =13008748377a(17) =69882215729a(18) =377172620330