Number of maximal matchings in the ladder graph P_2 X P_n.

Terms

a(0) =1a(1) =2a(2) =5a(3) =11a(4) =24a(5) =51a(6) =109a(7) =234a(8) =503a(9) =1081a(10) =2322a(11) =4987a(12) =10711a(13) =23006a(14) =49415a(15) =106139a(16) =227976a(17) =489669a(18) =1051759a(19) =2259072a(20) =4852259a(21) =10422163a(22) =22385754a(23) =48082339a(24) =103276009a(25) =221826440a(26) =476460797a(27) =1023389687a(28) =2198137722a(29) =4721377893