A029638 Numbers in the (1,2)-Pascal triangle A029635 that are different from 1.

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

Offset: 1

Author

Mohammad K. Azarian

Keywords

• nonn
• tabl
• frac

Examples

			Triangle begins:
  2;
  3,  2;
  4,  5,  2;
  5,  9,  7,  2;
  6, 14, 16,  9,  2;
  7, 20, 30, 25, 11,  2;
  ...
		

References

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

Links

• 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.

Crossrefs

Cf. A048601, A029656.

Extensions

More terms from David W. Wilson

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