A221507 - OEIS

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A221507 as a triangular array

									0
								1		0
							0		9		0
						1		44		64		0
					0		446		664		441		0
				1		3334		31663		12495		3025		0
			0		27540		730874		2691211		221614		20736		0
		1		219070		22664752		223123842		219689604		4010052		142129		0
	0		1766136		617892584		26917553016		61691224718

A221507 as a square array

0	1	0	1	0	1	0	1	0
0	9	44	446	3334	27540	219070	1766136
0	64	664	31663	730874	22664752	617892584
0	441	12495	2691211	223123842	26917553016
0	3025	221614	219689604	61691224718
0	20736	4010052
0	142129
0

A221507 as an upper right triangle

0	1	0	1	0	1	0	1	0
	0	9	44	446	3334	27540	219070	1766136
		0	64	664	31663	730874	22664752	617892584
			0	441	12495	2691211	223123842	26917553016
				0	3025	221614	219689604	61691224718
					0	20736	4010052
						0	142129
							0