W. Lang, Oct 09 2008 a(n,m) tabl head (triangle) for A144881 n\m 1 2 3 4 5 6 7 8 9 10 ... 1 1 0 0 0 0 0 0 0 0 0 2 3 1 0 0 0 0 0 0 0 0 3 12 3 1 0 0 0 0 0 0 0 4 60 21 3 1 0 0 0 0 0 0 5 360 96 21 3 1 0 0 0 0 0 6 2520 684 123 21 3 1 0 0 0 0 7 20160 4320 792 123 21 3 1 0 0 0 8 181440 35640 5292 873 123 21 3 1 0 0 9 1814400 293760 42768 5616 873 123 21 3 1 0 10 19958400 2881440 348840 45684 5859 873 123 21 3 1 . . . The row sums give A144882 = [1,4,16,85,481,3352,25420,223393,2157565,23241244,...]. They coincide with the row sums of the partition array A144880 (M31hat(3)). The columns are A001710(n+1)=(n+1)!/2, A144883, A144884,... #################################### e.o.f. ##############################################