# A371693 (b-file synthesized from sequence entry) 0 1 1 4 2 28 3 248 4 2480 5 26688 6 301648 7 3531424 8 42449088 9 520858496 10 6497190528 11 82146802944 12 1050370074624 13 13559126110720 14 176469550681344 15 2313050095245824 16 30506619439926272 17 404558181197010944 18 5391161355764205568 19 72156618656648237056 20 969557980700415827968