Triangle T(n,k) of the numbers of k-matchings in the n-Moebius ladder (0 <= k <= n, n > 2).

Terms

a(0) =1a(1) =9a(2) =18a(3) =6a(4) =1a(5) =12a(6) =42a(7) =44a(8) =7a(9) =1a(10) =15a(11) =75a(12) =145a(13) =95a(14) =13a(15) =1a(16) =18a(17) =117a(18) =336a(19) =420a(20) =192a(21) =18a(22) =1a(23) =21a(24) =168a(25) =644a(26) =1225a(27) =1085a(28) =371a(29) =31