# A003528 (b-file synthesized from sequence entry) 1 1 2 3 3 7 4 9 5 19 6 21 7 27 8 57 9 63 10 73 11 133 12 171 13 189 14 219 15 399 16 511 17 513 18 657 19 1197 20 1387 21 1533 22 1971 23 3591 24 4161 25 4599 26 9709 27 12483 28 13797 29 29127 30 37449 31 87381 32 262143