Index of first occurrence of -n in A000319, or -1 if -n never appears there.

Terms

a(0) =6a(1) =3a(2) =4a(3) =5a(4) =48a(5) =15642a(6) =14a(7) =87a(8) =924a(9) =23a(10) =1074a(11) =1066a(12) =14524a(13) =7051a(14) =15000a(15) =71709a(16) =57604a(17) =57554a(18) =2056626a(19) =2036049a(20) =16068a(21) =86a(22) =934a(23) =37142a(24) =57439a(25) =72635a(26) =57342a(27) =1394559a(28) =358329a(29) =2112076