# A150162 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 20 4 75 5 284 6 1137 7 4644 8 19393 9 81898 10 351374 11 1520815 12 6638275 13 29196703 14 129280300 15 575406783 16 2573623071 17 11562972805 18 52147022964 19 235977654475 20 1071303090569 21 4877507991969 22 22263040270667 23 101860633661824 24 467072841547863 25 2145980198046295 26 9878055487767915 27 45548567570957663