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A109820
Column 9 of array illustrated in A089574 and related to A034261.
8
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
0,1
LINKS
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
EXAMPLE
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
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).
Sequence in context: A331837 A254544 A268685 * A228290 A370715 A004993
KEYWORD
easy,nonn
AUTHOR
Alford Arnold, Jul 03 2005
EXTENSIONS
More terms with the program of A105552 from R. J. Mathar, Aug 28 2018
STATUS
approved