# A013228 (b-file synthesized from sequence entry) 0 0 1 0 2 -1 3 1 4 -6 5 15 6 -105 7 390 8 -3500 9 15785 10 -188685 11 946350 12 -15864750 13 90057825 14 -2127610485 15 15254857800 16 -444774915000 17 4213468013625 18 -130378398500025 19 1538133793366950 20 -48054409884965250