# A026721 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 12 4 29 5 68 6 163 7 376 8 895 9 2046 10 4845 11 11018 12 25997 13 58930 14 138699 15 313756 16 737185 17 1665342 18 3908059 19 8820378 20 20681069 21 46646884 22 109305969 23 246433804 24 577207671 25 1300924056 26 3046122447 27 6863883442 28 16068177699