85197125domain: NAppears in sequencesa(n) = Product_{k=0..n-1} (4^(3^k) + 1) = decimal value of the Sierpinski-type iteration result A292686(n) (replace 0 with 000 and 1 with 101) considered as a binary number.at n=3A292687Decimal values of the antidiagonals of the Sierpinski carpet considered as binary numbers.at n=26A292689