Number of n X 3 0..1 arrays with each 1 adjacent to 0, 2 or 4 king-move neighboring 1s.

A296720

Number of n X 3 0..1 arrays with each 1 adjacent to 0, 2 or 4 king-move neighboring 1s.

Terms

    a(0) =5a(1) =21a(2) =69a(3) =258a(4) =963a(5) =3493a(6) =12860a(7) =47305a(8) =173498a(9) =637397a(10) =2341283a(11) =8597415a(12) =31576458a(13) =115970574a(14) =425911328a(15) =1564226500a(16) =5744847726a(17) =21098720647a(18) =77488048294a(19) =284585727060

External references