# A248603 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 6 4 19 5 56 6 186 7 615 8 2127 9 7467 10 26720 11 96801 12 354901 13 1313293 14 4900266 15 18413166 16 69620351 17 264673536 18 1011100541 19 3879382837 20 14942671683 21 57760251344 22 223988614094 23 871159201568 24 3397330833310 25 13281696243924 26 52042973504510 27 204357290336561 28 804029764090404