# A321573 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 22 4 68 5 202 6 608 7 1822 8 5468 9 16402 10 49208 11 147622 12 442868 13 1328602 14 3985808 15 11957422 16 35872268 17 107616802 18 322850408 19 968551222 20 2905653668 21 8716961002 22 26150883008 23 78452649022 24 235357947068 25 706073841202 26 2118221523608 27 6354664570822 28 19063993712468