A284494 a(n) = A284016(n)^2.

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.

Links

Table of n, a(n) for n=-1..20.

Wikipedia, Ramanujan-Sato series.

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

Adjacent sequences: A284491 A284492 A284493 * A284495 A284496 A284497

Keyword

nonn

Author

Ralf Steiner, Mar 28 2017

Status

approved