# A180488 (b-file synthesized from sequence entry) 1 0 2 1 3 3 4 9 5 23 6 60 7 152 8 388 9 984 10 2501 11 6347 12 16117 13 40911 14 103864 15 263664 16 669352 17 1699216 18 4313673 19 10950739 20 27799745 21 70572839 22 179157364 23 454811656 24 1154592108 25 2931065640 26 7440849549 27 18889457819 28 47953075565