A176538 Partial sums of A018891.

0, 0, 1, 1, 2, 2, 3, 4, 5, 8, 10, 17, 26, 43, 90

Offset

1,5

Comments

Partial sums of number of positive knots with n crossings. The subsequence of distinct primes in this partial sum begins: 2, 3, 5, 17, 43.

Links

Table of n, a(n) for n=1..15.

Index entries for sequences related to knots

Formula

a(n) = SUM[i=1..n] A018891(i).

Example

a(15) = 0 + 0 + 1 + 0 + 1 + 0 + 1 + 1 + 1 + 3 + 2 + 7 + 9 + 17 + 47 = 90.

Crossrefs

Cf. A018891.

Sequence in context: A228693 A116676 A240575 * A285261 A100483 A182613

Adjacent sequences: A176535 A176536 A176537 * A176539 A176540 A176541

Keyword

nonn

Author

Jonathan Vos Post, Apr 19 2010

Status

approved