Number of pointed polyominoes with n cells.

Terms

a(0) =1a(1) =1a(2) =1a(3) =4a(4) =12a(5) =46a(6) =172a(7) =689a(8) =2763a(9) =11241a(10) =45706a(11) =186346a(12) =759375a(13) =3095191a(14) =12610825a(15) =51370336a(16) =209194923a(17) =851712069a(18) =3466881944