# A012820 (b-file synthesized from sequence entry) 0 1 1 -1 2 -11 3 -37 4 7145 5 450711 6 -3070179 7 -4923539597 8 -586954253103 9 57287087552943 10 41119408518068293 11 5965331366096594059 12 -2749345524263504663367 13 -1905635088547220040309433