# A006689 (b-file synthesized from sequence entry) 1 1 2 12 3 216 4 5248 5 160675 6 5931540 7 256182290 8 12665445248 9 705068085303 10 43631250229700 11 2970581345516818 12 220642839342906336 13 17753181687544516980 14 1538156947936524172656 15 142767837727544113783650