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A293440 First differences of A293230: how many more alive nodes there are in generation n+1 than in generation n in the binary tree of persistently squarefree numbers. 2
1, 1, 2, 2, 2, 3, 3, 4, 7, 9, 14, 17, 18, 30, 37, 53, 68, 82, 116, 149, 201, 289, 390, 510, 701, 921, 1241, 1682, 2277, 2990, 4054, 5489, 7247, 9778, 13222, 17684, 23849, 32146, 42930, 57828, 77679, 104443, 140343, 188387, 253322, 339990, 456855, 614187, 825548, 1108788, 1489668 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..50.

FORMULA

a(n) = A293230(1+n)-A293230(n).

a(n) = A293522(n) - A293520(n). [Equal to the number of bifurcating nodes minus the number of withering nodes.]

PROG

(Scheme) (define (A293440 n) (- (A293230 (+ 1 n)) (A293230 n)))

CROSSREFS

Cf. A293230, A293520, A293521, A293522, A293441.

Sequence in context: A008997 A005851 A275247 * A237121 A139821 A248972

Adjacent sequences:  A293437 A293438 A293439 * A293441 A293442 A293443

KEYWORD

nonn

AUTHOR

Antti Karttunen, Oct 12 2017

STATUS

approved

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Last modified May 21 03:05 EDT 2019. Contains 323434 sequences. (Running on oeis4.)