# A121431 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 3 5 4 6 9 7 15 8 22 9 30 10 69 11 118 12 178 13 250 14 335 15 769 16 1317 17 1995 18 2820 19 3810 20 4984 21 11346 22 19311 23 29126 24 41061 25 55410 26 72492 27 92652 28 208914 29 352636 30 528097 31 740035 32 993678 33 1294776 34 1649634 35 2065146 36 4613976 37 7722840 38 11476963 39 15971180