Where records occur in A261461.

Terms

a(0) =0a(1) =1a(2) =2a(3) =6a(4) =12a(5) =44a(6) =92a(7) =184a(8) =1208a(9) =1256a(10) =4792a(11) =9912a(12) =19832a(13) =39664a(14) =563952a(15) =576464a(16) =4496112a(17) =4499184a(18) =17996528a(19) =17997488a(20) =143972080a(21) =145057520a(22) =145070832a(23) =294967024a(24) =589944560a(25) =1179889136a(26) =2359778272a(27) =71079255008a(28) =72019201952