A256890 - OEIS

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A256890 as a triangular array

										1
									2		2
								4		12		4
							8		52		52		8
						16		196		416		196		16
					32		684		2644		2644		684		32
				64		2276		14680		26440		14680		2276		64
			128		7340		74652		220280		220280		74652		7340		128
		256		23172		357328		1623964		2643360		1623964		357328		23172		256
	512		72076		1637860		10978444		27227908		27227908		10978444		1637860		72076		512

A256890 as a square array

1	2	4	8	16	32	64	128	256	512
2	12	52	196	684	2276	7340	23172	72076
4	52	416	2644	14680	74652	357328	1637860
8	196	2644	26440	220280	1623964	10978444
16	684	14680	220280	2643360	27227908
32	2276	74652	1623964	27227908
64	7340	357328	10978444
128	23172	1637860
256	72076
512

A256890 as an upper right triangle

1	2	4	8	16	32	64	128	256	512
	2	12	52	196	684	2276	7340	23172	72076
		4	52	416	2644	14680	74652	357328	1637860
			8	196	2644	26440	220280	1623964	10978444
				16	684	14680	220280	2643360	27227908
					32	2276	74652	1623964	27227908
						64	7340	357328	10978444
							128	23172	1637860
								256	72076
									512