A261721 - OEIS

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A261721 as a triangular array

												1
											1		5
										1		6		15
									1		7		20		35
								1		8		25		50		70
							1		9		30		65		105		126
						1		10		35		80		140		196		210
					1		11		40		95		175		266		336		330
				1		12		45		110		210		336		462		540		495
			1		13		50		125		245		406		588		750		825		715
		1		14		55		140		280		476		714		960		1155		1210		1001
	1

A261721 as a square array

1	1	1	1	1	1	1	1	1	1	1	1
5	6	7	8	9	10	11	12	13	14
15	20	25	30	35	40	45	50	55
35	50	65	80	95	110	125	140
70	105	140	175	210	245	280
126	196	266	336	406	476
210	336	462	588	714
330	540	750	960
495	825	1155
715	1210
1001

A261721 as an upper right triangle

1	1	1	1	1	1	1	1	1	1	1	1
	5	6	7	8	9	10	11	12	13	14
		15	20	25	30	35	40	45	50	55
			35	50	65	80	95	110	125	140
				70	105	140	175	210	245	280
					126	196	266	336	406	476
						210	336	462	588	714
							330	540	750	960
								495	825	1155
									715	1210
										1001