Number of induced cycles in the 5 X n grid graph.

Terms

a(0) =0a(1) =4a(2) =14a(3) =58a(4) =229a(5) =749a(6) =2180a(7) =6188a(8) =17912a(9) =52620a(10) =154383a(11) =450195a(12) =1309452a(13) =3811888a(14) =11110432a(15) =32392550a(16) =94412963a(17) =275116777a(18) =801676752a(19) =2336222946a(20) =6808405238a(21) =19841419978a(22) =57821971765a(23) =168504312515a(24) =491055599116