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

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =1a(5) =1a(6) =0a(7) =9a(8) =0a(9) =9a(10) =0a(11) =1a(12) =56a(13) =216a(14) =378a(15) =435a(16) =324a(17) =189a(18) =54a(19) =27a(20) =0a(21) =1a(22) =13833a(23) =49464a(24) =84510a(25) =90944a(26) =69039a(27) =38448a(28) =16476a(29) =5184