# A001802 (b-file synthesized from sequence entry) 0 5 1 35 2 1260 3 4620 4 30030 5 90090 6 1021020 7 2771340 8 14549535 9 37182145 10 1487285800 11 3650610600 12 17644617900 13 42075627300 14 396713057400 15 925663800600 16 4281195077775 17 9821565178425 18 178970743251300 19 405039050516100 20 1822675727322450 21 4079321865912150