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

A297861

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

Terms

    a(0) =0a(1) =2a(2) =4a(3) =13a(4) =62a(5) =222a(6) =820a(7) =3159a(8) =11882a(9) =44870a(10) =169628a(11) =640493a(12) =2419796a(13) =9141186a(14) =34529922a(15) =130440579a(16) =492746204a(17) =1861372064a(18) =7031443952a(19) =26561657355a(20) =100338117488a(21) =379032792052

External references