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A284494
a(n) = A284016(n)^2.
0
1, 4, 4, 16, 100, 784, 7056, 69696, 736164, 8179600, 94556176, 1128422464, 13823175184, 173075968576, 2207601640000, 28610517254400, 375960078296100, 5000659311315600, 67231086296576400, 912554910950760000, 12492876730915904400, 172350707553043905600
OFFSET
-1,2
COMMENTS
There exists a set of Ramanujan-Sato series using this sequence.
Also a(n)=A002420(n+1)^2.
MATHEMATICA
Table[(2*CatalanNumber[n])^2, {n, -1, 20}]
CROSSREFS
Cf. A000108 (Catalan numbers), A284016, A002420.
Sequence in context: A060691 A075225 A204078 * A091541 A094354 A263389
KEYWORD
nonn
AUTHOR
Ralf Steiner, Mar 28 2017
STATUS
approved