# A012818 (b-file synthesized from sequence entry) 0 1 1 6 2 140 3 8456 4 957840 5 174293856 6 46514037440 7 17115342333056 8 8304761365213440 9 5137820023434733056 10 3947233200665413667840 11 3686931444647916864505856 12 4114664615209642258282352640