Starts of runs of 4 consecutive integers in A268375.

Terms

a(0) =1a(1) =2a(2) =16a(3) =17a(4) =47a(5) =241a(6) =242a(7) =1249a(8) =4049a(9) =120049a(10) =3693761a(11) =14268481a(12) =22997761a(13) =28140001a(14) =35296801a(15) =83747681a(16) =91801249a(17) =256692481a(18) =971435041a(19) =1261928321a(20) =1429948241a(21) =1691176481a(22) =1697230321a(23) =2168901521a(24) =3018800401a(25) =4199128081a(26) =5795553121a(27) =7626372001a(28) =7940268161a(29) =11438281249