# A184256 (b-file synthesized from sequence entry) 1 1 2 2 3 3 4 13 5 51 6 278 7 1500 8 7939 9 41835 10 216304 11 1098036 12 5469347 13 26720527 14 128062654 15 602383825 16 2782565907 17 12630464094 18 56374423419 19 247582918975 20 1070576473665 21 4560847659120