A028262 - OEIS

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A028262

Elements in 3-Pascal triangle (by row).

1, 1, 1, 1, 3, 1, 1, 4, 4, 1, 1, 5, 8, 5, 1, 1, 6, 13, 13, 6, 1, 1, 7, 19, 26, 19, 7, 1, 1, 8, 26, 45, 45, 26, 8, 1, 1, 9, 34, 71, 90, 71, 34, 9, 1, 1, 10, 43, 105, 161, 161, 105, 43, 10, 1, 1, 11, 53, 148, 266, 322, 266, 148, 53, 11, 1, 1, 12, 64, 201, 414, 588, 588, 414, 201, 64 (list; table; graph; refs; listen; history; internal format)

	OFFSET	`0,5`
	FORMULA	`After the 3rd row, use Pascal's rule.` `T(n, k) = C(n, k) + C(n-2, k-1). G.f.: (1+x^2y) / [1-x(1+y)]. - R. Stephan, Jan 31 2005`
	EXAMPLE	`1; 1 1; 1 3 1; 1 4 4 1; 1 5 8 5 1; ...`
	CROSSREFS	`Cf. A072405, A028275.` `Sequence in context: A077228 A049687 A132735 * A173117 A050177 A013580` `Adjacent sequences: A028259 A028260 A028261 * A028263 A028264 A028265`
	KEYWORD	`nonn,nice,tabl`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu)`

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Last modified February 17 03:37 EST 2012. Contains 205978 sequences.