Number of dyslexic identity planted planar trees with n+1 nodes.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =11a(6) =28a(7) =78a(8) =212a(9) =598a(10) =1686a(11) =4841a(12) =13975a(13) =40777a(14) =119698a(15) =353905a(16) =1051948a(17) =3143582a(18) =9436033a(19) =28443340a(20) =86055366a(21) =261253380a(22) =795587214a(23) =2429692385a(24) =7439569568a(25) =22834518491a(26) =70243063795a(27) =216527666056