# A296979 (b-file synthesized from sequence entry) 0 0 1 1 2 -1 3 3 4 -12 5 68 6 -480 7 4144 8 -42112 9 494360 10 -6581880 11 98079696 12 -1617373296 13 29245459176 14 -575367843960 15 12235339942344 16 -279650131845120 17 6836254328079936 18 -177979145883651648 19 4916243253642325056 20 -143602294106947553280 21 4422411460743707222784