# A012491 (b-file synthesized from sequence entry) 0 1 1 1 2 -3 3 -75 4 1337 5 144105 6 3933237 7 118760733 8 129911988593 9 47180864336337 10 13805291952312685 11 5130037600431416453 12 2642764719782227835049 13 1617152674535806453668025