# A069146 (b-file synthesized from sequence entry) 1 1248 2 1596 3 28272 4 30240 5 32760 6 463296 7 2178540 8 12865770 9 23569920 10 30998250 11 45532800 12 142990848 13 1379454720 14 1912369152 15 2623977450 16 43861478400 17 66433720320 18 153003540480 19 403031236608 20 489622536192 21 704575228896