Number of fixed polyquarcs with n cells.

Terms

a(0) =4a(1) =8a(2) =24a(3) =79a(4) =280a(5) =1048a(6) =4084a(7) =16184a(8) =64940a(9) =263622a(10) =1081044a(11) =4468567a(12) =18591600a(13) =77788504a(14) =327085708a(15) =1381268513a(16) =5855089128a(17) =24902486056a(18) =106231289368a(19) =454392461720