# A008274 (b-file synthesized from sequence entry) 1 0 2 8 3 408 4 18768 5 1106960 6 88667160 7 9451834728 8 1299134553248 9 223938037975968 10 47323771284289320 11 12033854252927528120 12 3625294706083960689648 13 1276951433892702568064688