# A321965 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 46 4 338 5 2996 6 30952 7 364148 8 4797116 9 69854968 10 1113018176 11 19244304872 12 358608737368 13 7160626365296 14 152458303437728 15 3446434090192816 16 82412163484132112 17 2077739630757428768 18 55068742629150564736 19 1530394053934299827168 20 44490672191650220419616