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A029638 Numbers in the (1,2)-Pascal triangle A029635 that are different from 1. 3
2, 2, 3, 2, 4, 5, 2, 5, 9, 7, 2, 6, 14, 16, 9, 2, 7, 20, 30, 25, 11, 2, 8, 27, 50, 55, 36, 13, 2, 9, 35, 77, 105, 91, 49, 15, 2, 10, 44, 112, 182, 196, 140, 64, 17, 2, 11, 54, 156, 294, 378, 336, 204, 81, 19, 2, 12, 65, 210, 450, 672, 714, 540, 285, 100, 21, 2, 13, 77, 275, 660, 1122 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

D. M. Bressoud, Proofs and Confirmations, Camb. Univ. Press, 1999; triangle on page 6, denominators.

LINKS

Table of n, a(n) for n=1..72.

Eric Weisstein's World of Mathematics, Alternating Sign Matrix.

D. Zeilberger, Dave Robbins's Art of Guessing, Adv. in Appl. Math. 34 (2005), 939-954.

EXAMPLE

Triangle begins:

  2;

  3,  2;

  4,  5,  2;

  5,  9,  7,  2;

  6, 14, 16,  9,  2;

  7, 20, 30, 25, 11,  2;

  ...

CROSSREFS

Cf. A048601, A029656.

Sequence in context: A144369 A033822 A144428 * A342297 A305820 A272831

Adjacent sequences:  A029635 A029636 A029637 * A029639 A029640 A029641

KEYWORD

nonn,tabl,frac

AUTHOR

Mohammad K. Azarian

EXTENSIONS

More terms from David W. Wilson

Leading 2 inserted as consequence of change in A029635 by Sean A. Irvine, Mar 01 2020

STATUS

approved

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Last modified September 16 07:19 EDT 2021. Contains 347469 sequences. (Running on oeis4.)