A156538 - OEIS

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A156538 as a triangular array

								2
							2		2
						2		-10		2
					2		-31		-31		2
				2		989		-406		989		2
			2		81578		-16213		-16213		81578		2
		2		-19816168		3777869		670556		3777869		-19816168		2
	2		-14445938413		2685823244		251846999		251846999		2685823244		-14445938413		2

A156538 as a square array

2	2	2	2	2	2	2	2
2	-10	-31	989	81578	-19816168	-14445938413
2	-31	-406	-16213	3777869	2685823244
2	989	-16213	670556	251846999
2	81578	3777869	251846999
2	-19816168	2685823244
2	-14445938413
2

A156538 as an upper right triangle

2	2	2	2	2	2	2	2
	2	-10	-31	989	81578	-19816168	-14445938413
		2	-31	-406	-16213	3777869	2685823244
			2	989	-16213	670556	251846999
				2	81578	3777869	251846999
					2	-19816168	2685823244
						2	-14445938413
							2