# A143582 (b-file synthesized from sequence entry) 1 1 2 3 3 20 4 56 5 576 6 1408 7 6656 8 5120 9 278528 10 622592 11 2752512 12 6029312 13 52428800 14 113246208 15 486539264 16 1040187392 17 11811160064 18 15032385536 19 317827579904 20 223338299392 21 5634997092352 22 11819749998592 23 3298534883328