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A122205 Number of finite sequences b with b(0) = 1, b(i+1) = b(i)+d where d|b(i), ending with n. 1
1, 1, 1, 2, 2, 5, 5, 12, 17, 31, 31, 96, 96, 197, 324, 629, 629, 1695, 1695, 4374, 6266, 10671, 10671, 34402, 38776, 73274, 109371, 223510, 223510, 634267, 634267, 1527075, 2172013, 3699717, 4557494, 12736034, 12736034, 25473763, 38283071 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..39.

FORMULA

a(1) = 1, for n>1, a(n) = sum_{d|n, d<n} a(n-d).

CROSSREFS

Cf. A117497, A122206, A067951.

Sequence in context: A030223 A300436 A056504 * A338762 A178115 A094967

Adjacent sequences:  A122202 A122203 A122204 * A122206 A122207 A122208

KEYWORD

nonn

AUTHOR

Franklin T. Adams-Watters, Aug 25 2006

STATUS

approved

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Last modified May 15 06:18 EDT 2021. Contains 343909 sequences. (Running on oeis4.)