a(n) = A369134(n, n).

Terms

a(0) =-1a(1) =1a(2) =-1a(3) =3a(4) =-1a(5) =5a(6) =-15a(7) =105a(8) =-21a(9) =105a(10) =-315a(11) =2475a(12) =-99a(13) =1001a(14) =-1001a(15) =15015a(16) =-105105a(17) =23205a(18) =-663a(19) =1322685a(20) =-101745a(21) =5595975a(22) =-2611455a(23) =60063465a(24) =-1225785a(25) =15935205a(26) =-51555075a(27) =4686825a(28) =-5368545a(29) =40970475