OFFSET
8,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 8..1000
Index entries for linear recurrences with constant coefficients, signature (14,-70,231, -973,2800, -5291,17289, -28574,30709, -127043,26684, -91944,352921, 496104,584696, 276192,-496944, -518400,-518400).
FORMULA
G.f.: (720*x^11 +720*x^10 +580*x^9 +2204*x^8 +755*x^7 +1105*x^6 +392*x^5 +262*x^4 +69*x^3 +28*x^2 +4*x+1) *x^8 / ((x-1) *(6*x-1) *(5*x-1) *(3*x-1) *(2*x-1) *(4*x-1) *(x+1) *(x^2+x+1) *(5*x^2+x+1) *(3*x^2+x+1) *(4*x^2+x+1) *(2*x^2+x+1) *(6*x^2+x+1)).
EXAMPLE
a(8) = 1: 1|2|3|4|5|6|7|8.
a(9) = 18: 14|2|3|5|6|7|8|9, 15|2|3|4|6|7|8|9, 1|25|3|4|6|7|8|9, 16|2|3|4|5|7|8|9, 1|26|3|4|5|7|8|9, 1|2|36|4|5|7|8|9, 17|2|3|4|5|6|8|9, 1|27|3|4|5|6|8|9, 1|2|37|4|5|6|8|9, 1|2|3|47|5|6|8|9, 1|28|3|4|5|6|7|9, 1|2|38|4|5|6|7|9, 1|2|3|48|5|6|7|9, 1|2|3|4|58|6|7|9, 1|2|39|4|5|6|7|8, 1|2|3|49|5|6|7|8, 1|2|3|4|59|6|7|8, 1|2|3|4|5|69|7|8.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Aug 20 2015
STATUS
approved