a(0) = 1; a(n) = -Sum_{k=0..floor((n-1)/2)} binomial(n-1,2*k) * a(k) * a(n-2*k-1).

A351941

a(0) = 1; a(n) = -Sum_{k=0..floor((n-1)/2)} binomial(n-1,2*k) * a(k) * a(n-2*k-1).

Terms

    a(0) =1a(1) =-1a(2) =1a(3) =0a(4) =-3a(5) =8a(6) =-3a(7) =-57a(8) =225a(9) =-96a(10) =-2991a(11) =13873a(12) =-255a(13) =-313506a(14) =1495089a(15) =1473024a(16) =-54621231a(17) =243365688a(18) =705129201a(19) =-14109279483a(20) =53228648865a(21) =349791931434

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