Let M = 4 X 4 matrix with rows /1,1,1,1/1,1,1,0/1,1,0,0/1,0,0,0/ and A(n) = vector (x(n),y(n),z(n),t(n)) = M^n*A where A is the vector (1,1,1,1); then a(n)=z(n).

A069005

Let M = 4 X 4 matrix with rows /1,1,1,1/1,1,1,0/1,1,0,0/1,0,0,0/ and A(n) = vector (x(n),y(n),z(n),t(n)) = M^n*A where A is the vector (1,1,1,1); then a(n)=z(n).

Terms

    a(0) =1a(1) =7a(2) =19a(3) =56a(4) =160a(5) =462a(6) =1329a(7) =3828a(8) =11021a(9) =31735a(10) =91376a(11) =263108a(12) =757588a(13) =2181389a(14) =6281058a(15) =18085587a(16) =52075371a(17) =149945056a(18) =431749580a(19) =1243173370a(20) =3579575053a(21) =10306975580a(22) =29677753369a(23) =85453685055a(24) =246054079584a(25) =708484485384

External references