# A354230 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 0 5 120 6 -1800 7 21000 8 -235200 9 2693880 10 -28690200 11 210447600 12 1465952400 13 -123513355680 14 4155643171680 15 -114924516470400 16 2886135295680000 17 -66750668391381120 18 1375830884058456960 19 -22036006671394705920 20 70186623981895296000 21 16180846322732941893120