# A218134 (b-file synthesized from sequence entry) 0 1 1 4 2 17 3 80 4 369 5 1700 6 7841 7 36160 8 166753 9 768996 10 3546289 11 16354000 12 75417809 13 347795396 14 1603886913 15 7396455680 16 34109360321 17 157298104900 18 725393076049 19 3345209499600 20 15426707209777 21 71141522037604 22 328074947492321 23 1512944453384000 24 6977067089461281