# A153904 (b-file synthesized from sequence entry) 0 1 1 2 2 1 3 1 4 2 5 2 6 2 7 4 8 3 9 5 10 6 11 8 12 8 13 24 14 15 15 28 16 52 17 66 18 85 19 246 20 226 21 453 22 898 23 1300 24 1806 25 6204 26 5820 27 13820 28 31156 29 51179 30 81402