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A230585 First terms of first rows of zigzag matrices as defined in A088961. 2

%I

%S 3,5,14,42,132,429,1430,4862,16796,58786,208012,742900,2674440,

%T 9694845,35357670,129644790,477638700,1767263190,6564120420,

%U 24466267020,91482563640,343059613650,1289904147324,4861946401452,18367353072152,69533550916004,263747951750360

%N First terms of first rows of zigzag matrices as defined in A088961.

%C a(n) = A088961(A056520(n-1));

%C a(n) = A000108(n+1) for n > 1.

%H Reinhard Zumkeller, <a href="/A230585/b230585.txt">Table of n, a(n) for n = 1..1000</a>

%F a(n) = binomial(2*n,n) - binomial(2*n,n+2) + 0^(n-1).

%o (Haskell)

%o a230585 1 = 3

%o a230585 n = a007318 (2*n) n - a007318 (2*n) (n+2)

%Y Cf. A007318.

%K nonn

%O 1,1

%A _Reinhard Zumkeller_, Oct 25 2013

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Last modified January 16 09:13 EST 2021. Contains 340204 sequences. (Running on oeis4.)