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

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =1a(8) =0a(9) =25a(10) =0a(11) =100a(12) =0a(13) =100a(14) =0a(15) =25a(16) =0a(17) =1a(18) =2252a(19) =15150a(20) =48600a(21) =99350a(22) =144150a(23) =156753a(24) =131000a(25) =87075a(26) =45000a(27) =19300a(28) =6000a(29) =1800