Feller, W. An introduction to probability theory and its applications. Vol. I. (English) Zbl 0039.13201 New York: John Wiley & Sons. 419 p. (1950). Reviewer: S. Vajda (Epsom, England) Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 18 ReviewsCited in 606 Documents MSC: 60-01 Introductory exposition (textbooks, tutorial papers, etc.) pertaining to probability theory Keywords:probability theory Citations:Zbl 0039.13301 × Cite Format Result Cite Review PDF Online Encyclopedia of Integer Sequences: From area of cyclic polygon of 2n + 1 sides. a(n) = (2n+1)!/n!^2. Catalan’s triangle T(n,k) (read by rows): each term is the sum of the entries above and to the left, i.e., T(n,k) = Sum_{j=0..k} T(n-1,j). First 2-digit number to appear n times in the decimal expansion of Pi.