Template:Seal triangles 2/left

triangle  A022166 and its row sums  A006116
k n	0	1	2	3	4	5	6	7	sums
0	1								1
1	1	1							2
2	1	3	1						5
3	1	7	7	1					16
4	1	15	35	15	1				67
5	1	31	155	155	31	1			374
6	1	63	651	1395	651	63	1		2825
7	1	127	2667	11811	11811	2667	127	1	29212