Take n points in general position in the plane; draw all the (infinite) straight lines joining them; sequence gives number of connected regions formed.

A055503

Take n points in general position in the plane; draw all the (infinite) straight lines joining them; sequence gives number of connected regions formed.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =7a(4) =18a(5) =41a(6) =85a(7) =162a(8) =287a(9) =478a(10) =756a(11) =1145a(12) =1672a(13) =2367a(14) =3263a(15) =4396a(16) =5805a(17) =7532a(18) =9622a(19) =12123a(20) =15086a(21) =18565a(22) =22617a(23) =27302a(24) =32683a(25) =38826a(26) =45800a(27) =53677a(28) =62532a(29) =72443

External references