Number of connected 2n-regular loopless multigraphs with five nodes.

Terms

a(0) =0a(1) =1a(2) =6a(3) =15a(4) =36a(5) =72a(6) =139a(7) =244a(8) =414a(9) =663a(10) =1030a(11) =1540a(12) =2247a(13) =3187a(14) =4433a(15) =6036a(16) =8088a(17) =10658a(18) =13861a(19) =17785a(20) =22571a(21) =28329a(22) =35227a(23) =43401a(24) =53049a(25) =64333a(26) =77485a(27) =92697a(28) =110235a(29) =130324