Triangle read by rows: T(n,k) is the number of k-matchings in the P_4 X P_n lattice graph.

Terms

a(0) =1a(1) =1a(2) =3a(3) =1a(4) =1a(5) =10a(6) =29a(7) =26a(8) =5a(9) =1a(10) =17a(11) =102a(12) =267a(13) =302a(14) =123a(15) =11a(16) =1a(17) =24a(18) =224a(19) =1044a(20) =2593a(21) =3388a(22) =2150a(23) =552a(24) =36a(25) =1a(26) =31a(27) =395a(28) =2696a(29) =10769