# A127262 (b-file synthesized from sequence entry) 0 2 1 2 2 28 3 80 4 496 5 1952 6 9856 7 43136 8 204544 9 926720 10 4307968 11 19736576 12 91168768 13 419176448 14 1932378112 15 8894873600 16 40978284544 17 188695052288 18 869129519104 19 4002599665664 20 18434753560576 21 84900703109120