A221876 - OEIS

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A221876 as a triangular array

											1
										2		1
									5		2		1
								12		5		2		1
							28		12		5		2		1
						64		28		12		5		2		1
					144		64		28		12		5		2		1
				320		144		64		28		12		5		2		1
			704		320		144		64		28		12		5		2		1
		1536		704		320		144		64		28		12		5		2		1
	3328		1536		704		320		144		64		28		12		5		2		1

A221876 as a square array

1	2	5	12	28	64	144	320	704	1536	3328
1	2	5	12	28	64	144	320	704	1536
1	2	5	12	28	64	144	320	704
1	2	5	12	28	64	144	320
1	2	5	12	28	64	144
1	2	5	12	28	64
1	2	5	12	28
1	2	5	12
1	2	5
1	2
1

A221876 as an upper right triangle

1	2	5	12	28	64	144	320	704	1536	3328
	1	2	5	12	28	64	144	320	704	1536
		1	2	5	12	28	64	144	320	704
			1	2	5	12	28	64	144	320
				1	2	5	12	28	64	144
					1	2	5	12	28	64
						1	2	5	12	28
							1	2	5	12
								1	2	5
									1	2
										1