A261477 - OEIS

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A261477 as a triangular array

												1
											0		1
										0		0		1
									0		0		0		1
								0		0		0		0		1
							0		0		0		0		0		1
						0		0		0		1		3		3		1
					0		0		0		0		7		14		7		1
				0		0		0		0		7		44		42		12		1
			0		0		0		1		21		138		210		102		18		1
		0		0		0		0		50		458		985		720		210		25		1
	0		0		0		0		77		1397		4400		4587		1980		385		33		1

A261477 as a square array

1	0	0	0	0	0	0	0	0	0	0	0
1	0	0	0	0	0	0	0	0	0	0
1	0	0	0	0	0	0	0	0	0
1	0	0	1	0	0	1	0	0
1	0	3	7	7	21	50	77
1	3	14	44	138	458	1397
1	7	42	210	985	4400
1	12	102	720	4587
1	18	210	1980
1	25	385
1	33
1

A261477 as an upper right triangle

1	0	0	0	0	0	0	0	0	0	0	0
	1	0	0	0	0	0	0	0	0	0	0
		1	0	0	0	0	0	0	0	0	0
			1	0	0	1	0	0	1	0	0
				1	0	3	7	7	21	50	77
					1	3	14	44	138	458	1397
						1	7	42	210	985	4400
							1	12	102	720	4587
								1	18	210	1980
									1	25	385
										1	33
											1