%I

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

%N Partial sums of A018891.

%C 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.

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

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

%Y Cf. A018891.

%K nonn

%O 1,5

%A _Jonathan Vos Post_, Apr 19 2010