# A216491 (b-file synthesized from sequence entry) 0 12 1 60 2 300 3 1500 4 7500 5 37500 6 187500 7 937500 8 4687500 9 23437500 10 117187500 11 585937500 12 2929687500 13 14648437500 14 73242187500 15 366210937500 16 1831054687500 17 9155273437500 18 45776367187500 19 228881835937500 20 1144409179687500 21 5722045898437500 22 28610229492187500