OFFSET
0,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (8, -32, 88, -188, 328, -480, 600, -646, 600, -480, 328, -188, 88, -32, 8, -1).
FORMULA
G.f.: (x^8-4*x^7+16*x^6-28*x^5+38*x^4-28*x^3+16*x^2-4*x+1) / ((x^2+1)^4*(x-1)^8).
a(n) = A282011(n+7,n).
EXAMPLE
a(0) = 1: {}.
a(1) = 4: {2}, {4}, {6}, {8}.
a(2) = 16: {1,3}, {1,5}, {1,7}, {1,9}, {2,4}, {2,6}, {2,8}, {3,5}, {3,7}, {3,9}, {4,6}, {4,8}, {5,7}, {5,9}, {6,8}, {7,9}.
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Alois P. Heinz, Feb 05 2017
STATUS
approved