a(n,k) tabl head (triangle) for A235943 n\k 0 1 2 3 4 5 6 7 8 9 10 11 12 13 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 6 0 0 0 0 0 0 0 0 0 0 4 16 0 0 0 8 0 0 0 0 0 0 0 0 0 5 60 50 0 0 0 10 0 0 0 0 0 0 0 0 6 456 144 108 0 0 0 12 0 0 0 0 0 0 0 7 3458 1078 294 196 0 0 0 14 0 0 0 0 0 0 8 29296 7936 2240 512 320 0 0 0 16 0 0 0 0 0 9 275166 66096 16200 4104 810 486 0 0 0 18 0 0 0 0 10 2843980 611200 135600 29200 6900 1200 700 0 0 0 20 0 0 0 11 32108164 6248682 1250414 247566 48400 10890 1694 968 0 0 0 22 0 0 12 393499248 69926976 12776976 2285568 417384 75456 16368 2304 1296 0 0 0 24 0 13 5205200806 850848414 142879360 23421372 3866720 663494 112216 23660 3042 1690 0 0 0 26