A306550 - OEIS

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A306550 as a triangular array

											1
										0		1
									0		1		0
								0		1		0		0
							0		1		1		0		0
						0		1		6		0		0		0
					0		1		25		2		0		0		0
				0		1		90		56		0		0		0		0
			0		1		301		790		25		0		0		0		0
		0		1		966		8380		1895		6		0		0		0		0
	0		1		3025		76482		70370		2116		1		0		0		0		0

A306550 as a square array

1	0	0	0	0	0	0	0	0	0	0
1	1	1	1	1	1	1	1	1	1
0	0	1	6	25	90	301	966	3025
0	0	0	2	56	790	8380	76482
0	0	0	0	25	1895	70370
0	0	0	0	6	2116
0	0	0	0	1
0	0	0	0
0	0	0
0	0
0

A306550 as an upper right triangle

1	0	0	0	0	0	0	0	0	0	0
	1	1	1	1	1	1	1	1	1	1
		0	0	1	6	25	90	301	966	3025
			0	0	0	2	56	790	8380	76482
				0	0	0	0	25	1895	70370
					0	0	0	0	6	2116
						0	0	0	0	1
							0	0	0	0
								0	0	0
									0	0
										0