Number of blobs with 2n+1 edges.

Terms

a(0) =1a(1) =1a(2) =2a(3) =7a(4) =27a(5) =118a(6) =537a(7) =2570a(8) =12587a(9) =63173a(10) =322385a(11) =1669144a(12) =8742999a(13) =46253727a(14) =246771340a(15) =1326236480a(16) =7173280391a(17) =39017312543a(18) =213287030596