A153726 Initial digit of Catalan number A000108(n).

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

Offset

0,3

Links

Amiram Eldar, Table of n, a(n) for n = 0..10000

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