Number of n-node connected achiral planar maps with an external face in which all internal faces are triangles.

A378339

Number of n-node connected achiral planar maps with an external face in which all internal faces are triangles.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =15a(4) =46a(5) =139a(6) =449a(7) =1448a(8) =4799a(9) =15971a(10) =54107a(11) =184048a(12) =633365a(13) =2188644a(14) =7624153a(15) =26659774a(16) =93772014a(17) =330946542a(18) =1173233805a(19) =4171572088a(20) =14884905583a(21) =53249784377a(22) =191043396323a(23) =686956509123

External references