A131968 - OEIS

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A131968 as a triangular array

									1
								3		2
							6		5		4
						11		10		8		7
					18		17		14		13		9
				29		28		23		21		15		12
			42		41		35		33		25		20		16
		61		60		51		48		37		32		26		19
	86		85		71		68		54		46		38		31		22

A131968 as a square array

1	3	6	11	18	29	42	61	86
2	5	10	17	28	41	60	85
4	8	14	23	35	51	71
7	13	21	33	48	68
9	15	25	37	54
12	20	32	46
16	26	38
19	31
22

A131968 as an upper right triangle

1	3	6	11	18	29	42	61	86
	2	5	10	17	28	41	60	85
		4	8	14	23	35	51	71
			7	13	21	33	48	68
				9	15	25	37	54
					12	20	32	46
						16	26	38
							19	31
								22