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A299017
Intersection of A264041 and A000217.
1
1, 3, 6, 10, 21, 36, 55, 78, 105, 136, 171, 210, 253, 300, 351
OFFSET
1,2
FORMULA
Conjectures (Start)
G.f.: x*(1 + 6*x^4 - 3*x^5) / (1 - x)^3.
a(n) = 6 - 7*n + 2*n^2 for n>3.
a(n) = 3*a(n-1) - 3*a(n-2) + a(n-3) for n>3.
(End)
CROSSREFS
Sequence in context: A068855 A068882 A076713 * A136569 A061883 A027671
KEYWORD
nonn,more
AUTHOR
Colin Barker, Jan 31 2018
STATUS
approved