A255420 Ludic recurrence: Iterates of f(n) = A003309(n+1) starting from n=1.

1, 2, 3, 5, 11, 37, 181, 1361, 13927, 183871, 3005533, 59045717

Offset

0,2

Links

Table of n, a(n) for n=0..11.

Donovan Johnson, Ludic numbers computed up to A003309(1236290) = 23000711

Formula

a(0) = 1; for n >= 1: a(n) = A003309(1+a(n-1)).

Other identities. For all n >= 0:

a(n) = A237126(A000225(n+1)).

a(n) = A255421(A007097(n)).

Prog

(Scheme, with memoization-macro definec)
(definec (A255420 n) (if (zero? n) 1 (A003309 (+ 1 (A255420 (- n 1))))))
(Haskell)
a255420 n = a255420_list !! n
a255420_list = iterate (a003309 . (+ 1)) 1
-- Reinhard Zumkeller, Feb 25 2015

Crossrefs

Cf. A000225, A003309, A007097, A237126, A255421.

Sequence in context: A065510 A006721 A111289 * A127181 A323611 A113734

Adjacent sequences: A255417 A255418 A255419 * A255421 A255422 A255423

Keyword

nonn,more

Author

Antti Karttunen, Feb 23 2015

Status

approved