# A335578 (b-file synthesized from sequence entry) 0 1 1 -1 2 -6 3 15 4 272 5 -745 6 -29976 7 61271 8 6065856 9 -2723697 10 -1941455080 11 -3989345041 12 897021218400 13 4964061925511 14 -562221881675832 15 -5689641396555705 16 456732442022509184 17 7321841133968133023 18 -464200472167634521800 19 -10961686347887871324289 20 573373115861405030522400