Number of n X 4 binary matrices under row and column permutations and column complementations.

Terms

a(0) =1a(1) =1a(2) =5a(3) =11a(4) =41a(5) =101a(6) =301a(7) =757a(8) =1981a(9) =4714a(10) =11133a(11) =24763a(12) =53818a(13) =111941a(14) =226857a(15) =444260a(16) =848620a(17) =1576226a(18) =2862426a(19) =5077454a(20) =8827758a(21) =15043096a(22) =25183794a(23) =41434222a(24) =67108437a(25) =107051463a(26) =168402958a(27) =261384026a(28) =400684767a(29) =606936536