Number of unsensed planar maps with n edges.

Terms

a(0) =1a(1) =2a(2) =4a(3) =14a(4) =52a(5) =248a(6) =1416a(7) =9172a(8) =66366a(9) =518868a(10) =4301350a(11) =37230364a(12) =333058463a(13) =3057319072a(14) =28656583950a(15) =273298352168