Number of tilings of a 3 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

A127867

Number of tilings of a 3 X n board with 1 X 1 and L-shaped tiles (where the L-shaped tiles cover 3 squares).

Terms

    a(0) =1a(1) =1a(2) =11a(3) =39a(4) =195a(5) =849a(6) =3895a(7) =17511a(8) =79339a(9) =358397a(10) =1620843a(11) =7326991a(12) =33127155a(13) =149766353a(14) =677103839a(15) =3061202815a(16) =13839823275a(17) =62570318397a(18) =282882722979

External references