Number of nX3 0..1 arrays with every element unequal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.

A303891

Number of nX3 0..1 arrays with every element unequal to 1, 2, 3 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =23a(2) =54a(3) =271a(4) =842a(5) =3420a(6) =11916a(7) =45404a(8) =163979a(9) =611654a(10) =2237701a(11) =8282518a(12) =30442766a(13) =112364696a(14) =413696068a(15) =1525420791a(16) =5619579530a(17) =20713550451a(18) =76324380196a(19) =281291917100

External references