# A246657 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 7 4 24 5 87 6 332 7 1320 8 5407 9 22672 10 96844 11 419910 12 1843386 13 8176962 14 36594388 15 165026353 16 749170529 17 3420949803 18 15702232962 19 72407225094 20 335276107549 21 1558289108596 22 7267201176311 23 33996105203757 24 159484982985619 25 750134031377432