# A013468 (b-file synthesized from sequence entry) 0 1 1 -1 2 -1 3 4 4 5 5 -32 6 -55 7 390 8 961 9 -6432 10 -22463 11 134550 12 649761 13 -3443208 14 -22456551 15 105379838 16 911433121 17 -3787776224 18 -42942180863 19 157078439014 20 2324211078513 21 -7384507525560 22 -143088139308519