# A073949 (b-file synthesized from sequence entry) 1 0 2 2 3 6 4 12 5 30 6 90 7 252 8 702 9 2106 10 6480 11 19602 12 58806 13 176904 14 532170 15 1596510 16 4785156 17 14351094 18 43053282 19 129146724 20 387400806 21 1162202418 22 3486725352 23 10460294154 24 31380882462 25 94143001680 26 282430067922 27 847290203766 28 2541867422652 29 7625599079310