Let v[0]={0,1,1,2}, v[n]=M.v[n-1], where M={{0, 1, 0, 0}, {0, 0, 1, 0}, {0, 0, 0, 1}, {1, 10, 19, 1}}; then a(n) =v[n][[1]] (the first term).

A104095

Let v[0]={0,1,1,2}, v[n]=M.v[n-1], where M={{0, 1, 0, 0}, {0, 0, 1, 0}, {0, 0, 0, 1}, {1, 10, 19, 1}}; then a(n) =v[n][[1]] (the first term).

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =31a(5) =80a(6) =690a(7) =2522a(8) =16463a(9) =71361a(10) =410068a(11) =1933079a(12) =10454444a(13) =51354986a(14) =269730280a(15) =1351952533a(16) =7000832157a(17) =35436588070a(18) =182241654663a(19) =926897102096

External references