A221337 - OEIS

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A221337 as a triangular array

										0
									2		2
								0		6		0
							4		20		20		4
						0		68		0		68		0
					8		232		790		790		232		8
				0		792		0		10704		0		792		0
			16		2704		34042		142792		142792		34042		2704		16
		0		9232		0		1937900		0		1937900		0		9232		0
	32		31520		1470618		26264018

A221337 as a square array

0	2	0	4	0	8	0	16	0	32
2	6	20	68	232	792	2704	9232	31520
0	20	0	790	0	34042	0	1470618
4	68	790	10704	142792	1937900	26264018
0	232	0	142792	0
8	792	34042	1937900
0	2704	0
16	9232
0

A221337 as an upper right triangle

0	2	0	4	0	8	0	16	0	32
	2	6	20	68	232	792	2704	9232	31520
		0	20	0	790	0	34042	0	1470618
			4	68	790	10704	142792	1937900	26264018
				0	232	0	142792	0
					8	792	34042	1937900
						0	2704	0
							16	9232
								0