a(n) is the total number of interior points of over all (>=,>=)-polyominoes of length n.

A382990

a(n) is the total number of interior points of over all (>=,>=)-polyominoes of length n.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =2a(4) =13a(5) =59a(6) =230a(7) =830a(8) =2858a(9) =9547a(10) =31227a(11) =100599a(12) =320417a(13) =1011664a(14) =3172230a(15) =9892182a(16) =30708696a(17) =94975383a(18) =292822629a(19) =900431037a(20) =2762584182a(21) =8459318100a(22) =25859561685a(23) =78934174379a(24) =240626872721a(25) =732695058014

External references