Number of identity trees with n nodes where the maximal outdegree (branching factor) equals 4.

A245749

Number of identity trees with n nodes where the maximal outdegree (branching factor) equals 4.

Terms

    a(0) =2a(1) =6a(2) =21a(3) =63a(4) =185a(5) =512a(6) =1403a(7) =3750a(8) =9928a(9) =25969a(10) =67462a(11) =174039a(12) =446884a(13) =1142457a(14) =2911078a(15) =7396049a(16) =18746761a(17) =47420345a(18) =119746936a(19) =301941284a(20) =760387426a(21) =1912814031a(22) =4807298905a(23) =12071798139a(24) =30292240853a(25) =75965728619a(26) =190398931985a(27) =476980247827

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