Number of Hi-Lo arrangements HL(m,n) of a deck with n suits and m ranks in each suit, m>=1, n>=1.

Terms

a(0) =0a(1) =2a(2) =0a(3) =6a(4) =2a(5) =0a(6) =14a(7) =30a(8) =2a(9) =0a(10) =78a(11) =230a(12) =174a(13) =2a(14) =0a(15) =230a(16) =14094a(17) =4834a(18) =1092a(19) =2a(20) =0a(21) =1902a(22) =187106a(23) =3785126a(24) =114442a(25) =7188a(26) =2a(27) =0a(28) =6902a(29) =26185806