# A015489 (b-file synthesized from sequence entry) 0 1 1 4 2 17 3 289 4 18785 5 4827745 6 4948438625 7 20273753046625 8 332185443668950625 9 21770437421732017110625 10 5707011317919939625464790625 11 5984240806710536532650993759190625