Decimal values of the antidiagonals of the Sierpinski carpet considered as binary numbers.

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =31a(5) =45a(6) =119a(7) =231a(8) =325a(9) =975a(10) =2015a(11) =2925a(12) =8191a(13) =16383a(14) =23405a(15) =61431a(16) =118759a(17) =166725a(18) =499151a(19) =1030623a(20) =1495405a(21) =4186623a(22) =8372735a(23) =11960685a(24) =31392247a(25) =60686823a(26) =85197125a(27) =255591375a(28) =528222175a(29) =766774125