Number of nX3 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300634

Number of nX3 0..1 arrays with every element equal to 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =6a(2) =13a(3) =34a(4) =91a(5) =253a(6) =705a(7) =1978a(8) =5507a(9) =15222a(10) =41977a(11) =115897a(12) =320655a(13) =888366a(14) =2462325a(15) =6824338a(16) =18907933a(17) =52373153a(18) =145049587a(19) =401721354a(20) =1112657323a(21) =3081952434a(22) =8537004059a(23) =23647611701a(24) =65503496945a(25) =181441284654a(26) =502578971705

External references