A118981 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

A118981 as a triangular array

											1
										1		1
									1		2		3
								1		3		6		4
							1		4		10		12		7
						1		5		15		25		25		11
					1		6		21		44		60		48		18
				1		7		28		70		119		133		91		29
			1		8		36		104		210		296		284		168		47
		1		9		45		147		342		576		699		585		306		76
	1		10		55		200		525		1022		1485		1580		1175		550		123

A118981 as a square array

1	1	1	1	1	1	1	1	1	1	1
1	2	3	4	5	6	7	8	9	10
3	6	10	15	21	28	36	45	55
4	12	25	44	70	104	147	200
7	25	60	119	210	342	525
11	48	133	296	576	1022
18	91	284	699	1485
29	168	585	1580
47	306	1175
76	550
123

A118981 as an upper right triangle

1	1	1	1	1	1	1	1	1	1	1
	1	2	3	4	5	6	7	8	9	10
		3	6	10	15	21	28	36	45	55
			4	12	25	44	70	104	147	200
				7	25	60	119	210	342	525
					11	48	133	296	576	1022
						18	91	284	699	1485
							29	168	585	1580
								47	306	1175
									76	550
										123