Number of nX3 0..1 arrays with every element unequal to 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

A305218

Number of nX3 0..1 arrays with every element unequal to 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =4a(2) =8a(3) =15a(4) =31a(5) =92a(6) =264a(7) =784a(8) =2378a(9) =7342a(10) =22596a(11) =69617a(12) =214983a(13) =664217a(14) =2052307a(15) =6342935a(16) =19606074a(17) =60603932a(18) =187335711a(19) =579091828a(20) =1790098137a(21) =5533594957a(22) =17105617402a(23) =52877461311a(24) =163456660240a(25) =505283076436

External references