# A027167 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 7 4 15 5 24 6 50 7 81 8 165 9 266 10 544 11 875 12 1787 13 2876 14 5870 15 9445 16 19281 17 31022 18 63324 19 101887 20 207975 21 334624 22 683050 23 1099001 24 2243325 25 3609426 26 7367704 27 11854355 28 24197587 29 38932996 30 79471590 31 127866765 32 261006761