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A153726 Initial digit of Catalan number A000108(n). 0
1, 1, 2, 5, 1, 4, 1, 4, 1, 4, 1, 5, 2, 7, 2, 9, 3, 1, 4, 1, 6, 2, 9, 3, 1, 4, 1, 6, 2, 1, 3, 1, 5, 2, 8, 3, 1, 4, 1, 6, 2, 1, 3, 1, 5, 2, 8, 3, 1, 5, 1, 7, 2, 1, 4, 1, 6, 2, 1, 4, 1, 6, 2, 9, 3, 1, 5, 2, 8, 3, 1, 5, 2, 7, 3, 1, 4, 1, 7, 2, 1, 4, 1, 6, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..85.

FORMULA

a(n)=A000030(A000108(n)).

MATHEMATICA

First[IntegerDigits[#]]&/@CatalanNumber[Range[0, 120]] (* Harvey P. Dale, Jan 20 2014 *)

CROSSREFS

Cf. A000030, A008963, A077648, A152669.

Sequence in context: A239969 A105686 A316131 * A229339 A274880 A034005

Adjacent sequences:  A153723 A153724 A153725 * A153727 A153728 A153729

KEYWORD

base,nonn

AUTHOR

Omar E. Pol, Dec 30 2008

EXTENSIONS

More terms from Harvey P. Dale, Jan 20 2014

STATUS

approved

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Last modified July 21 22:02 EDT 2019. Contains 325210 sequences. (Running on oeis4.)