Card-matching numbers (Dinner-Diner matching numbers).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =1a(6) =1a(7) =0a(8) =16a(9) =0a(10) =36a(11) =0a(12) =16a(13) =0a(14) =1a(15) =346a(16) =1824a(17) =4536a(18) =7136a(19) =7947a(20) =6336a(21) =3936a(22) =1728a(23) =684a(24) =128a(25) =48a(26) =0a(27) =1a(28) =748521a(29) =3662976