# A150085 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 19 4 65 5 241 6 905 7 3599 8 14425 9 59534 10 249329 11 1056921 12 4552398 13 19735824 14 86589754 15 382354053 16 1700890992 17 7617683252 18 34282253718 19 155195308290 20 705421980080 21 3220837523649 22 14762428021071 23 67892389467223 24 313323316552737 25 1450092203641912 26 6730788726949523 27 31321971802780059