# A013520 (b-file synthesized from sequence entry) 0 0 1 2 2 9 3 100 4 1237 5 18896 6 337663 7 6941194 8 161357425 9 4186540456 10 119942830785 11 3761004532550 12 128121728853479 13 4711881688294652 14 186065500280409423 15 7852240169544076190 16 352684377274345906213 17 16798134072300013751064