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

A303803

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

Terms

    a(0) =3a(1) =7a(2) =9a(3) =15a(4) =27a(5) =47a(6) =83a(7) =161a(8) =321a(9) =641a(10) =1293a(11) =2665a(12) =5603a(13) =11957a(14) =25767a(15) =55917a(16) =122063a(17) =267835a(18) =590085a(19) =1303845a(20) =2886875a(21) =6401619a(22) =14212171a(23) =31580661a(24) =70221799a(25) =156218863a(26) =347655099a(27) =773886975a(28) =1723025065a(29) =3836799089

External references