# A027162 (b-file synthesized from sequence entry) 2 4 3 15 4 112 5 440 6 3328 7 13552 8 103168 9 429696 10 3282944 11 13882880 12 106307584 13 454471680 14 3485499392 15 15022878720 16 115345653760 17 500317061120 18 3844727111680 19 16761479102464 20 128891635105792 21 564250624917504 22 4341301000536064