A186686 - OEIS

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

A186686 as a triangular array

												1
											2		1
										3		4		1
									4		10		6		1
								3		20		21		8		1
							1		31		56		36		10		1
						0		38		120		120		55		12		1
					0		38		213		322		220		78		14		1
				0		30		321		724		705		364		105		16		1
			0		17		414		1400		1897		1353		560		136		18		1
		0		6		456		2364		4410		4218		2366		816		171		20		1
	0		1		427		3515		9020		11374		8365		3860		1140		210		22		1

A186686 as a square array

1	2	3	4	3	1	0	0	0	0	0	0
1	4	10	20	31	38	38	30	17	6	1
1	6	21	56	120	213	321	414	456	427
1	8	36	120	322	724	1400	2364	3515
1	10	55	220	705	1897	4410	9020
1	12	78	364	1353	4218	11374
1	14	105	560	2366	8365
1	16	136	816	3860
1	18	171	1140
1	20	210
1	22
1

A186686 as an upper right triangle

1	2	3	4	3	1	0	0	0	0	0	0
	1	4	10	20	31	38	38	30	17	6	1
		1	6	21	56	120	213	321	414	456	427
			1	8	36	120	322	724	1400	2364	3515
				1	10	55	220	705	1897	4410	9020
					1	12	78	364	1353	4218	11374
						1	14	105	560	2366	8365
							1	16	136	816	3860
								1	18	171	1140
									1	20	210
										1	22
											1