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

A300430

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

Terms

    a(0) =1a(1) =6a(2) =13a(3) =33a(4) =87a(5) =228a(6) =611a(7) =1656a(8) =4479a(9) =12100a(10) =32579a(11) =87705a(12) =236468a(13) =638292a(14) =1723867a(15) =4656414a(16) =12576659a(17) =33964397a(18) =91716558a(19) =247664253a(20) =668787690a(21) =1806042197a(22) =4877289821a(23) =13171458556a(24) =35570422970a(25) =96059902903a(26) =259414009161

External references