# A051684 (b-file synthesized from sequence entry) 1 0 2 -1 3 -3 4 -3 5 5 6 15 7 -21 8 -133 9 27 10 1215 11 935 12 -12441 13 -23673 14 138047 15 469455 16 -1601265 17 -9112561 18 18108927 19 182135007 20 -161934625 21 -3804634785 22 -404007681 23 83297957567