# A112572 (b-file synthesized from sequence entry) 0 1 1 1 2 -1 3 3 4 -6 5 18 6 -52 7 156 8 -481 9 1512 10 -4828 11 15621 12 -51081 13 168537 14 -560309 15 1874975 16 -6309964 17 21341241 18 -72497698 19 247247463 20 -846187023 21 2905210526 22 -10003144986 23 34532780087 24 -119499263663 25 414431066955 26 -1440182574644 27 5014115406096