# A006217 (b-file synthesized from sequence entry) 0 5 1 16 2 56 3 224 4 1024 5 5296 6 30656 7 196544 8 1383424 9 10608976 10 88057856 11 786632864 12 7525556224 13 76768604656 14 831846342656 15 9541952653184 16 115516079079424 17 1471865234248336 18 19689636672045056 19 275914012819601504