A213548 - OEIS

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A213548 as a triangular array

											1
										5		3
									15		12		6
								35		31		22		10
							70		65		53		35		15
						126		120		105		81		51		21
					210		203		185		155		115		70		28
				330		322		301		265		215		155		92		36
			495		486		462		420		360		285		201		117		45
		715		705		678		630		560		470		365		253		145		55
	1001

A213548 as a square array

1	5	15	35	70	126	210	330	495	715	1001
3	12	31	65	120	203	322	486	705
6	22	53	105	185	301	462	678
10	35	81	155	265	420	630
15	51	115	215	360	560
21	70	155	285	470
28	92	201	365
36	117	253
45	145
55

A213548 as an upper right triangle

1	5	15	35	70	126	210	330	495	715	1001
	3	12	31	65	120	203	322	486	705
		6	22	53	105	185	301	462	678
			10	35	81	155	265	420	630
				15	51	115	215	360	560
					21	70	155	285	470
						28	92	201	365
							36	117	253
								45	145
									55