Centered Triangular Number
المؤلف:
Sloane, N. J. A.
المصدر:
Sequence A005448/M3378 in "The On-Line Encyclopedia of Integer Sequences."
الجزء والصفحة:
...
16-12-2020
1146
Centered Triangular Number
A centered triangular number is a centered polygonal number consisting of a central dot with three dots around it, and then additional dots in the gaps between adjacent dots. The 
th term is 
, and the first few such numbers for 
, 1, 2, ... are 1, 4, 10, 19, 31, 46, 64, ... (OEIS A005448). The generating function giving the centered triangular numbers is
REFERENCES:
Sloane, N. J. A. Sequence A005448/M3378 in "The On-Line Encyclopedia of Integer Sequences."
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