Penrice Christmas gift numbers, Card-matching numbers (Dinner-Diner matching numbers).

Terms

a(0) =1a(1) =0a(2) =0a(3) =2a(4) =4a(5) =0a(6) =16a(7) =0a(8) =4a(9) =80a(10) =192a(11) =216a(12) =128a(13) =96a(14) =0a(15) =8a(16) =4752a(17) =10752a(18) =11776a(19) =7680a(20) =3936a(21) =1024a(22) =384a(23) =0a(24) =16a(25) =440192a(26) =975360a(27) =1035680a(28) =696320a(29) =329600