A011857 - OEIS

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A011857 as a triangular array

												2
											3		1
										4		3		1
									5		5		3		1
								6		7		6		3		1
							7		10		11		8		4		1
						8		14		18		17		11		4		1
					9		18		28		31		25		14		5		1
				10		22		40		52		50		35		17		5		1
			11		27		55		82		92		77		47		20		6		1
		12		33		73		123		158		154		113		61		24		6		1
	13		39		95		178		257		286		245		160

A011857 as a square array

2	3	4	5	6	7	8	9	10	11	12	13
1	3	5	7	10	14	18	22	27	33	39
1	3	6	11	18	28	40	55	73	95
1	3	8	17	31	52	82	123	178
1	4	11	25	50	92	158	257
1	4	14	35	77	154	286
1	5	17	47	113	245
1	5	20	61	160
1	6	24
1	6
1

A011857 as an upper right triangle

2	3	4	5	6	7	8	9	10	11	12	13
	1	3	5	7	10	14	18	22	27	33	39
		1	3	6	11	18	28	40	55	73	95
			1	3	8	17	31	52	82	123	178
				1	4	11	25	50	92	158	257
					1	4	14	35	77	154	286
						1	5	17	47	113	245
							1	5	20	61	160
								1	6	24
									1	6
										1