# A074446 (b-file synthesized from sequence entry) 1 1 2 0 3 2 4 6 5 15 6 40 7 153 8 528 9 1841 10 6528 11 23901 12 87550 13 322875 14 1198080 15 4474738 16 16779264 17 63164175 18 238605640 19 904213989 20 3436000050 21 13089461538 22 49977753600 23 191219550297 24 733008101200 25 2814750270420 26 10825959997440 27 41699998413248 28 160842848628150 29 621186162441675