102780domain: NAppears in sequencesn is equal to the number of 1's in all numbers <= n written in base 9.at n=9A014884Theta series of lattice D3 tensor D3* (dimension 9, det. 262144, min. norm 6).at n=36A033694Numbers <= 10^6 with valid Luhn mod 10 check digit, sorted first by check digit, then lexicographically.at n=30A249855