Number of blobs with 2n+1 edges.

Terms

a(0) =1a(1) =1a(2) =4a(3) =21a(4) =126a(5) =818a(6) =5594a(7) =39693a(8) =289510a(9) =2157150a(10) =16348960a(11) =125642146a(12) =976789620a(13) =7668465964a(14) =60708178054a(15) =484093913917