a(n) is the number of quiddities of 3-periodic dissections of (n + 2)-gons.

A348666

a(n) is the number of quiddities of 3-periodic dissections of (n + 2)-gons.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =49a(6) =166a(7) =577a(8) =2050a(9) =7414a(10) =27201a(11) =100984a(12) =378651a(13) =1431901a(14) =5454718a(15) =20912754a(16) =80630085a(17) =312430832a(18) =1216045522a(19) =4752132953a(20) =18638125275a(21) =73340870891a(22) =289463959745

External references