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 A081205 Staircase on Pascal's triangle. 1
 1, 3, 10, 20, 70, 126, 462, 792, 3003, 5005, 19448, 31824, 125970, 203490, 817190, 1307504, 5311735, 8436285, 34597290, 54627300, 225792840, 354817320, 1476337800, 2310789600, 9669554100, 15084504396, 63432274896, 98672427616 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Arrange Pascal's triangle as a square array. A081204 is then a diagonal staircase on the square array. The steps are (1,3),(10,20),(70,126),(462,792),.... LINKS FORMULA a(n)=binomial(ceiling((n+1)/2)+(n+1), n). CROSSREFS Cf. A065942, A081181, A081204. Sequence in context: A208951 A005997 A213850 * A092305 A196166 A073604 Adjacent sequences:  A081202 A081203 A081204 * A081206 A081207 A081208 KEYWORD easy,nonn AUTHOR Paul Barry, Mar 11 2003 STATUS approved

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