W. Lang, Sep 14 2007 a(n,m) tabl head (triangle) for A051186 n\m 1 2 3 4 5 6 7 8 9 ... 1 1 0 0 0 0 0 0 0 0 2 -7 1 0 0 0 0 0 0 0 3 98 -21 1 0 0 0 0 0 0 4 -2058 539 -42 1 0 0 0 0 0 5 57624 -17150 1715 -70 1 0 0 0 0 6 -2016840 657874 -77175 4165 -105 1 0 0 0 7 84707280 -29647548 3899224 -252105 8575 -147 1 0 0 8 -4150656720 1537437132 -220709524 16252369 -672280 15778 -196 1 0 9 232436776320 -90247136112 13897170476 -1130842188 53900049 -1555848 26754 -252 1 . . . The first column gives A051188(n-1). The row sums give A049209(n-1)*(-1)^(n-1). The unsigned row sums give A045754(n). ############################################# e.o.f. #################################################