A056559 - OEIS

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A056559

Tetrahedron with T(t,n,k)=t-n; succession of growing finite triangles with declining values per row.

0, 1, 0, 0, 2, 1, 1, 0, 0, 0, 3, 2, 2, 1, 1, 1, 0, 0, 0, 0, 4, 3, 3, 2, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 7, 6, 6, 5, 5, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	FORMULA	`a(n) =A056556(n)-A056557(n)`
	EXAMPLE	`First triangle: [0]; second triangle: [1; 0 0]; third triangle: [2; 1 1; 0 0 0]; ...`
	CROSSREFS	`Together with A056558 and A056560 might enable reading "by antidiagonals" of cube arrays as 3-dimensional analogue of A002262 and A025581 with square arrays.` `Sequence in context: A025901 A204431 A143809 * A117200 A107015 A015374` `Adjacent sequences: A056556 A056557 A056558 * A056560 A056561 A056562`
	KEYWORD	`nonn`
	AUTHOR	`Henry Bottomley (se16(AT)btinternet.com), Jun 26 2000`

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Last modified February 15 09:54 EST 2012. Contains 205763 sequences.