A139813 - OEIS

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

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A139813 as a triangular array

										1
									2		2
								2		2		2
							2		6		6		2
						2		8		6		8		2
					2		10		20		20		10		2
				2		12		30		20		30		12		2
			2		14		42		70		70		42		14		2
		2		16		56		112		70		112		56		16		2
	2		18		72		168		252		252		168		72		18		2
2		20		90		240		420		252		420		240		90		20		2

A139813 as a square array

1	2	2	2	2	2	2	2	2	2	2
2	2	6	8	10	12	14	16	18	20
2	6	6	20	30	42	56	72	90
2	8	20	20	70	112	168	240
2	10	30	70	70	252	420
2	12	42	112	252	252
2	14	56	168	420
2	16	72	240
2	18	90
2	20
2

A139813 as an upper right triangle

1	2	2	2	2	2	2	2	2	2	2
	2	2	6	8	10	12	14	16	18	20
		2	6	6	20	30	42	56	72	90
			2	8	20	20	70	112	168	240
				2	10	30	70	70	252	420
					2	12	42	112	252	252
						2	14	56	168	420
							2	16	72	240
								2	18	90
									2	20
										2

										1
									2		2
								2		2		2
							2		6		6		2
						2		8		6		8		2
					2		10		20		20		10		2
				2		12		30		20		30		12		2
			2		14		42		70		70		42		14		2
		2		16		56		112		70		112		56		16		2
	2		18		72		168		252		252		168		72		18		2
2		20		90		240		420		252		420		240		90		20		2

1	2	2	2	2	2	2	2	2	2	2
2	2	6	8	10	12	14	16	18	20
2	6	6	20	30	42	56	72	90
2	8	20	20	70	112	168	240
2	10	30	70	70	252	420
2	12	42	112	252	252
2	14	56	168	420
2	16	72	240
2	18	90
2	20
2

1	2	2	2	2	2	2	2	2	2	2
	2	2	6	8	10	12	14	16	18	20
		2	6	6	20	30	42	56	72	90
			2	8	20	20	70	112	168	240
				2	10	30	70	70	252	420
					2	12	42	112	252	252
						2	14	56	168	420
							2	16	72	240
								2	18	90
									2	20
										2

										1
									2		2
								2		2		2
							2		6		6		2
						2		8		6		8		2
					2		10		20		20		10		2
				2		12		30		20		30		12		2
			2		14		42		70		70		42		14		2
		2		16		56		112		70		112		56		16		2
	2		18		72		168		252		252		168		72		18		2
2		20		90		240		420		252		420		240		90		20		2

1	2	2	2	2	2	2	2	2	2	2
2	2	6	8	10	12	14	16	18	20
2	6	6	20	30	42	56	72	90
2	8	20	20	70	112	168	240
2	10	30	70	70	252	420
2	12	42	112	252	252
2	14	56	168	420
2	16	72	240
2	18	90
2	20
2

1	2	2	2	2	2	2	2	2	2	2
	2	2	6	8	10	12	14	16	18	20
		2	6	6	20	30	42	56	72	90
			2	8	20	20	70	112	168	240
				2	10	30	70	70	252	420
					2	12	42	112	252	252
						2	14	56	168	420
							2	16	72	240
								2	18	90
									2	20
										2

										1
									2		2
								2		2		2
							2		6		6		2
						2		8		6		8		2
					2		10		20		20		10		2
				2		12		30		20		30		12		2
			2		14		42		70		70		42		14		2
		2		16		56		112		70		112		56		16		2
	2		18		72		168		252		252		168		72		18		2
2		20		90		240		420		252		420		240		90		20		2

1	2	2	2	2	2	2	2	2	2	2
2	2	6	8	10	12	14	16	18	20
2	6	6	20	30	42	56	72	90
2	8	20	20	70	112	168	240
2	10	30	70	70	252	420
2	12	42	112	252	252
2	14	56	168	420
2	16	72	240
2	18	90
2	20
2

1	2	2	2	2	2	2	2	2	2	2
	2	2	6	8	10	12	14	16	18	20
		2	6	6	20	30	42	56	72	90
			2	8	20	20	70	112	168	240
				2	10	30	70	70	252	420
					2	12	42	112	252	252
						2	14	56	168	420
							2	16	72	240
								2	18	90
									2	20
										2