a(n) = [x^n] (F(x)/F(-x))^n where F(x) = (1 + x)*(1 + x^3).
A362408
a(n) = [x^n] (F(x)/F(-x))^n where F(x) = (1 + x)*(1 + x^3).
Terms
- a(0) =1a(1) =2a(2) =8a(3) =44a(4) =256a(5) =1502a(6) =8912a(7) =53510a(8) =324352a(9) =1980332a(10) =12160008a(11) =75015162a(12) =464566144a(13) =2886488906a(14) =17985045464a(15) =112333392044a(16) =703119387648
External references
- oeis: A362408