A109820 Column 9 of array illustrated in A089574 and related to A034261.

6, 126, 992, 4921, 18450, 57198, 154420, 375106, 838075, 1749221, 3449895, 6485363, 11699374, 20362113, 34340211, 56319046, 90089305, 140911696, 215975810, 324971445, 480793226, 700402096, 1005870222, 1425639066, 1996023823, 2763001135, 3784320961, 5131987727, 6895160406, 9183525995, 12131205973

Offset: 0

Author

Alford Arnold, Jul 03 2005

Keywords

• easy
• nonn

Examples

			The associated sequences begin for n = 15 through 19:
........................1.......5
........................3.......18
................3.......18......60
........3.......18......60......150
1.......7.......25......65......140
........................6.......42
................12......84......324
........12......84......324.....924
........6.......42......162.....462
4.......32......132.....392.....952
........................10......80
................30......240.....1050
........10......90......420.....1400
........30......240.....1050....3360
1.......11......56......196.....546
........................15......135
................60......540.....2640
........15......165.....900.....3420
........................21......210
................35......385.....2205
........................28......308
........................1.......19
therefore this sequence begins
6 126 992 4921 18450
		

Links

• Index entries for linear recurrences with constant coefficients, signature (11,-55,165,-330,462,-462,330,-165,55,-11,1).

Crossrefs

Cf. A109126.

Cf. A000330 (column 2), A086602 (column 3), A089574 (column 4), A107600 (column 5), A107601 (column 6), A109125 (column 7), A109126 (column 8), A109820 (column 9), A108538 (column 10), A109821 (column 11), A110553 (column 12), A110624 (column 13).

Formula

G.f. 6 -x*( 126 -394*x +939*x^2 -1911*x^3 +2803*x^4 -2825*x^5 +1964*x^6 -939*x^7 +298*x^8 -57*x^9 +5*x^10)/(x-1)^11 . - R. J. Mathar, Aug 28 2018

Extensions

More terms with the program of A105552 from R. J. Mathar, Aug 28 2018