A152670 Even Catalan numbers.

2, 14, 42, 132, 1430, 4862, 16796, 58786, 208012, 742900, 2674440, 35357670, 129644790, 477638700, 1767263190, 6564120420, 24466267020, 91482563640, 343059613650, 1289904147324, 4861946401452, 18367353072152, 69533550916004

Offset

1,1

Links

G. C. Greubel, Table of n, a(n) for n = 1..543

Mathematica

Select[CatalanNumber[Range[30]], EvenQ] (* Vladimir Reshetnikov, Nov 02 2015 *)

Prog

(PARI) lista(nn) = for (n=1, nn, if (((c=binomial(2*n, n)/(n+1)) % 2) == 0, print1(c, ", "))); \\ Michel Marcus, Nov 02 2015

Crossrefs

Cf. A000108, A038003, A152671.

Sequence in context: A230801 A231081 A364218 * A109137 A192375 A267247

Adjacent sequences: A152667 A152668 A152669 * A152671 A152672 A152673

Keyword

easy,nonn

Author

Omar E. Pol, Dec 10 2008

Status

approved