Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

A207560

Number of n X 4 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.

Terms

    a(0) =9a(1) =81a(2) =241a(3) =636a(4) =2135a(5) =6709a(6) =23276a(7) =78733a(8) =277781a(9) =973608a(10) =3477827a(11) =12422849a(12) =44780404a(13) =161681185a(14) =586480585a(15) =2130883040a(16) =7761845079a(17) =28308582237a(18) =103395253764a(19) =377977638085

External references