Number of nX3 0..1 arrays with every element equal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

A297973

Number of nX3 0..1 arrays with every element equal to 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =3a(2) =8a(3) =20a(4) =124a(5) =501a(6) =2410a(7) =11304a(8) =53108a(9) =251672a(10) =1189220a(11) =5629257a(12) =26643680a(13) =126113485a(14) =596993794a(15) =2825991213a(16) =13377659542a(17) =63327123116a(18) =299778122298

External references