# A048721 (b-file synthesized from sequence entry) 0 0 1 1 2 3 3 7 4 23 5 151 6 4247 7 1052823 8 8590987415 9 18014407100469399 10 309485009839359475825250455 11 11150372599265311880252868975683656578240663 12 6901746346790563787434755873427398051716420852423255530846180802039959