Number of unlabeled asymmetric 4-ary cacti having n polygons.

A052395

Number of unlabeled asymmetric 4-ary cacti having n polygons.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =6a(4) =28a(5) =193a(6) =1140a(7) =7688a(8) =52364a(9) =373560a(10) =2732836a(11) =20506254a(12) =156899748a(13) =1221179922a(14) =9642327324a(15) =77092881840a(16) =623120435820

External references