OFFSET
1,1
COMMENTS
Equivalently the number of terms of A001405 with n digits.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..1000
EXAMPLE
a(1) = 5 because there are 5 terms of A001405 with 1 digit : 1, 1, 2, 3, 6.
PROG
(PARI) seq(n)={my(v=vector(n), k=0, t=1); while(t<=#v, v[t]++; k++; t=1+logint(binomial(k, k\2), 10)); v} \\ Andrew Howroyd, Feb 03 2020
CROSSREFS
KEYWORD
easy,nonn,base
AUTHOR
Ctibor O. Zizka, Mar 09 2008
EXTENSIONS
Name clarified and terms a(58) and beyond from Andrew Howroyd, Feb 03 2020
STATUS
approved