A360299 a(n) is the number of terms in the n-th row of A360298.

1, 1, 1, 1, 1, 2, 2, 3, 5, 10, 10, 15, 15, 29, 44, 73, 73, 136, 136, 264, 383, 740, 740, 1418, 2440, 4727, 7831, 15154, 15154, 25836, 25836, 46502, 69638, 139276, 240132, 447972, 447972, 880859, 1343707, 2448270, 2448270, 4742231, 4742231, 9309245, 17932278

Offset

1,6

Links

Table of n, a(n) for n=1..45.

Rémy Sigrist, PARI program

Formula

a(n) <= a(n+1) <= 2*a(n).

a(p) = a(p-1) for any prime number p.

Example

For n = 9:
- the 9th row of A360298 is (10080, 70, 5670, 4480, 362880),
- so a(9) = 5.

Prog

(PARI) See Links section.

Crossrefs

Cf. A360298.

Sequence in context: A208437 A130377 A260956 * A344708 A322113 A153900

Adjacent sequences: A360296 A360297 A360298 * A360300 A360301 A360302

Keyword

nonn

Author

Rémy Sigrist, Feb 02 2023

Status

approved