A231219 - OEIS

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A231219 as a triangular array

										3
									4		4
								7		9		7
							12		22		22		12
						23		59		93		59		23
					44		156		408		408		156		44
				87		413		1793		2892		1793		413		87
			172		1098		7844		20027		20027		7844		1098		172
		343		2919		34609		139438		226764		139438		34609		2919		343
	684		7760		152421		969461

A231219 as a square array

3	4	7	12	23	44	87	172	343	684
4	9	22	59	156	413	1098	2919	7760
7	22	93	408	1793	7844	34609	152421
12	59	408	2892	20027	139438	969461
23	156	1793	20027	226764
44	413	7844	139438
87	1098	34609
172	2919
343

A231219 as an upper right triangle

3	4	7	12	23	44	87	172	343	684
	4	9	22	59	156	413	1098	2919	7760
		7	22	93	408	1793	7844	34609	152421
			12	59	408	2892	20027	139438	969461
				23	156	1793	20027	226764
					44	413	7844	139438
						87	1098	34609
							172	2919
								343