# A140176 (b-file synthesized from sequence entry) 1 1 2 3 3 8 4 17 5 36 6 71 7 144 8 289 9 594 10 1231 11 2602 12 5573 13 12128 14 26727 15 59668 16 134729 17 307618 18 709503 19 1652402 20 3883445 21 9206712