# A139170 (b-file synthesized from sequence entry) 1 3 2 2 3 3 4 31 5 25 6 2 7 721 8 16 9 561 10 13 11 3628801 12 11 13 479001601 14 361 15 9 16 316 17 20922789888001 18 281 19 6402373705728001 20 7 21 241 22 1814401 23 1124000727777607680001 24 6 25 1596673 26 239500801 27 1478401 28 181