A178400 - OEIS

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A178400 as a triangular array

												4
											5		5
										6		7		7
									8		8		9		9
								10		10		10		12		12
							13		13		14		14		14		15
						15		16		16		16		16		18		18
					18		18		19		19		20		20		20		20
				21		21		22		22		22		22		22		24		24
			24		24		24		24		25		25		26		26		26		26
		26		28		28		28		28		30		30		30		30		30		30
	31

A178400 as a square array

4	5	6	8	10	13	15	18	21	24	26	31
5	7	8	10	13	16	18	21	24	28
7	9	10	14	16	19	22	24	28
9	12	14	16	19	22	24	28
12	14	16	20	22	25	28
15	18	20	22	25	30
18	20	22	26	30
20	24	26	30
24	26	30
26	30
30

A178400 as an upper right triangle

4	5	6	8	10	13	15	18	21	24	26	31
	5	7	8	10	13	16	18	21	24	28
		7	9	10	14	16	19	22	24	28
			9	12	14	16	19	22	24	28
				12	14	16	20	22	25	28
					15	18	20	22	25	30
						18	20	22	26	30
							20	24	26	30
								24	26	30
									26	30
										30