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A027167
a(n) = Sum_{k=0..floor(n/2)} A027157(n-k, k).
0
1, 2, 4, 7, 15, 24, 50, 81, 165, 266, 544, 875, 1787, 2876, 5870, 9445, 19281, 31022, 63324, 101887, 207975, 334624, 683050, 1099001, 2243325, 3609426, 7367704, 11854355, 24197587, 38932996, 79471590, 127866765, 261006761
OFFSET
0,2
FORMULA
Empirical g.f.: (1+x)^2*(1-x+x^2) / ((1-x)*(1-2*x^2-3*x^4-4*x^6)). - Colin Barker, Feb 20 2016
CROSSREFS
Sequence in context: A002956 A333613 A171276 * A259090 A358832 A232464
KEYWORD
nonn
STATUS
approved