# A358954 (b-file synthesized from sequence entry) 0 1 1 4 2 36 3 384 4 4568 5 57920 6 768760 7 10543120 8 148247390 9 2125715618 10 30965114225 11 456956616284 12 6817011617601 13 102640570550600 14 1557716916728198 15 23804070258610024 16 365964582592739540 17 5656501536118793076 18 87846324474413129008 19 1370097609728212588634 20 21451062781643458337802