A269722 Triangle read by rows: coefficients of polynomials arising as traces of certain web-coloring matrices.

1, 2, 2, 6, 8, 6, 24, 30, 42, 24, 120, 116, 216, 264, 120, 720, 532, 1002, 1920, 1920, 720, 5040, 2848, 4626, 11688, 19200, 15840, 5040

Offset: 1

Author

N. J. A. Sloane, Mar 04 2016

Keywords

• nonn
• tabl
• more

Examples

			Triangle begins:
     1
     2    2
     6    8    6
    24   30   42    24
   120  116  216   264   120
   720  532 1002  1920  1920   720
  5040 2848 4626 11688 19200 15840 5040
  ...
		

Links

• Mark Dukes, Chris D. White, Web Matrices: Structural Properties and Generating Combinatorial Identities, arXiv:1603.01589 [math.CO], 2016. See Fig. 7 p. 19.
• Mark Dukes, Chris D. White, Web Matrices: Structural Properties and Generating Combinatorial Identities, Electronic Journal Of Combinatorics, 23(1) (2016), #P1.45.

Crossrefs

Outer diagonals are A000142. Another diagonal is A121635.

Cf. A281351.