A265897 Numbers n for which (2n+1)! / n! [= A000407(n)] is >= k! but < 2*k! for some k; positions of ones in A265891.

0, 1, 3, 8, 11, 14, 17, 20, 23, 30, 37, 41, 52, 56, 60, 64, 68, 72, 76, 89, 93, 97, 106, 110, 119, 128, 132, 137, 146, 155, 164, 169, 178, 183, 197, 202, 216, 221, 226, 231, 260, 265, 270, 275, 280, 285, 290, 295, 300, 331, 336, 341, 346, 351, 367, 372, 377, 393, 398, 403, 414, 419, 435, 440, 451, 456, 467, 472, 483, 494, 499, 510

Offset: 0

Author

Antti Karttunen, Dec 24 2015

Keywords

• nonn

Comments

a(0) = 0 is a special case in this sequence, thus the indexing starts from zero.

Numbers n such that A000407(n) is in A265334.

Links

• Antti Karttunen, Table of n, a(n) for n = 0..845

Crossrefs

Cf. A000407, A265891, A265334.

Cf. also A265898.