a(n) is the number of interior points over all Motzkin polyominoes of length n.

A369360

a(n) is the number of interior points over all Motzkin polyominoes of length n.

Terms

    a(0) =1a(1) =6a(2) =25a(3) =93a(4) =324a(5) =1088a(6) =3565a(7) =11487a(8) =36564a(9) =115327a(10) =361194a(11) =1124932a(12) =3487857a(13) =10774350a(14) =33181365a(15) =101924727a(16) =312402600a(17) =955728009a(18) =2919095808a(19) =8903220174a(20) =27121002621a(21) =82525328253a(22) =250867833102a(23) =761946207338

External references