Number of maximal matchings in the grid graph P_3 X P_n.

Terms

a(0) =2a(1) =5a(2) =22a(3) =75a(4) =264a(5) =941a(6) =3286a(7) =11623a(8) =40960a(9) =144267a(10) =508812a(11) =1792981a(12) =6319994a(13) =22277291a(14) =78518760a(15) =276763545a(16) =975517878a(17) =3438444583a(18) =12119670866a(19) =42718700667a(20) =150572583140a(21) =530730064095