Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 5 or 7 king-move adjacent elements, with upper left element zero.

A304922

Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 5 or 7 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =8a(1) =9a(2) =31a(3) =87a(4) =266a(5) =851a(6) =2510a(7) =7348a(8) =21910a(9) =65581a(10) =195382a(11) =581778a(12) =1734115a(13) =5169644a(14) =15407810a(15) =45920848a(16) =136868173a(17) =407941876a(18) =1215873162a(19) =3623912739a(20) =10801114566a(21) =32192856740a(22) =95951141082a(23) =285983353689a(24) =852376442742

External references