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A173449 Partial sums of A006894. 0
1, 3, 7, 18, 85, 2364, 2600425, 3374964379317, 5695183504495988993642596, 16217557574922386301420542667438374091771757190157, 13150458684796235687181874578063117114329409897631406061666638548823646377599560502379804093488299 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Partial sums of number of planted 3-trees of height < n. The subsequence of primes in this partial sum begins: 3, 7, no more through a(13).

LINKS

Table of n, a(n) for n=1..11.

FORMULA

a(n) = SUM[i=1..n] A006894(i) = SUM[i=1..n] SUM[j=1..i] A002658(j).

EXAMPLE

a(10) = 1 + 2 + 4 + 11 + 67 + 2279 + 2598061 + 3374961778892 + 5695183504492614029263279 + 16217557574922386301420536972254869595782763547561.

CROSSREFS

Cf. A006894, A002658, A036602.

Sequence in context: A110578 A134045 A079898 * A270519 A212848 A217371

Adjacent sequences:  A173446 A173447 A173448 * A173450 A173451 A173452

KEYWORD

nonn

AUTHOR

Jonathan Vos Post, Feb 18 2010

STATUS

approved

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Last modified June 1 09:53 EDT 2020. Contains 334762 sequences. (Running on oeis4.)