cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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A171999 Triangle of trinomial coefficients.

Original entry on oeis.org

1, 1, 2, 1, 3, 6, 1, 4, 6, 12, 1, 5, 10, 20, 30, 1, 6, 15, 20, 30, 60, 90, 1, 7, 21, 35, 42, 105, 140, 210, 1, 8, 28, 56, 70, 168, 280, 420, 560, 1, 9, 36, 72, 84, 126, 252, 504, 630, 756, 1260, 1680, 1, 10, 45, 90, 120, 210, 252, 360, 840, 1260, 2520, 3150, 4200, 1, 11, 55
Offset: 1

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Author

Clark Kimberling, Jan 21 2010

Keywords

Comments

Number of numbers in row n is given by A086753.
Row sums: A092255.
See A046816, Pascal's pyramid of trinomial coefficients.

Examples

			First six rows:
1
1...2
1...3...6
1...4...6....12
1...5...10...20...30
1...6...15...20...30...60...90

Crossrefs

Cf. A036038, A046816, A092255.
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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