# A124698 (b-file synthesized from sequence entry) 0 1 1 5 2 13 3 29 4 73 5 185 6 481 7 1265 8 3361 9 8993 10 24193 11 65345 12 177025 13 480641 14 1307137 15 3559169 16 9699841 17 26452481 18 72173569 19 196989953 20 537802753 21 1468536833 22 4010582017 23 10954043393 24 29920862209 25 81733033985 26 223274237953