# A037984 (b-file synthesized from sequence entry) 4 1 5 5 6 15 7 31 8 60 9 108 10 171 11 264 12 396 13 556 14 770 15 1050 16 1375 17 1785 18 2295 19 2880 20 3600 21 4425 22 5395