# A013397 (b-file synthesized from sequence entry) 0 1 1 0 2 1 3 -1 4 9 5 -25 6 235 7 -1125 8 12145 9 -83305 10 1037475 11 -9280225 12 132009625 13 -1456021125 14 23378099875 15 -306453818125 16 5493040502625 17 -83388492864625 18 1652566180607875 19 -28500730684349625 20 619275939126495625