A268740 - OEIS

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A268740 as a triangular array

										0
									1		1
								2		4		2
							5		15		15		5
						10		48		80		48		10
					20		145		396		396		145		20
				38		420		1788		2876		1788		420		38
			71		1183		7831		19591		19591		7831		1183		71
		130		3264		33170		128232		200204		128232		33170		3264		130
	235		8865		137868		816009		1971414

A268740 as a square array

0	1	2	5	10	20	38	71	130	235
1	4	15	48	145	420	1183	3264	8865
2	15	80	396	1788	7831	33170	137868
5	48	396	2876	19591	128232	816009
10	145	1788	19591	200204	1971414
20	420	7831	128232
38	1183	33170
71	3264
130

A268740 as an upper right triangle

0	1	2	5	10	20	38	71	130	235
	1	4	15	48	145	420	1183	3264	8865
		2	15	80	396	1788	7831	33170	137868
			5	48	396	2876	19591	128232	816009
				10	145	1788	19591	200204	1971414
					20	420	7831	128232
						38	1183	33170
							71	3264
								130