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 A153726 Initial digit of Catalan number A000108(n). 1
 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 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

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Last modified January 25 04:27 EST 2021. Contains 340416 sequences. (Running on oeis4.)