# A381913 (b-file synthesized from sequence entry) 0 1 1 4 2 28 3 245 4 2422 5 25860 6 291106 7 3405405 8 41014131 9 505344113 10 6341182427 11 80768735045 12 1041645452650 13 13575670575944 14 178528253213469 15 2366073408348545 16 31571528771106126 17 423794981085407622 18 5718929869862880055 19 77539914280883389432 20 1055790501909183080512