# A307494 (b-file synthesized from sequence entry) 0 1 1 1 2 6 3 30 4 145 5 680 6 3151 7 14394 8 65217 9 293223 10 1310255 11 5820697 12 25725139 13 113161286 14 495659656 15 2162471602 16 9399682398 17 40716499477 18 175798072996 19 756709512011 20 3247830724594 21 13901967775738 22 59352638426839 23 252778786749676 24 1074061758972744 25 4553583433874616 26 19264461634793094