A128188 Row sums of A128187.

1, 2, 3, 5, 5, 9, 7, 13, 10, 17, 12, 23, 14, 27, 18, 32, 20, 38, 22, 44, 26, 48, 28, 56, 31, 60, 35, 66, 37, 74, 39, 80, 43, 84, 47, 93, 49, 97, 53, 105, 55, 113, 57, 119, 63, 123, 65, 133, 68, 139, 72, 145, 74, 153, 78, 161, 82, 165, 84, 177, 86, 181, 92, 188, 96, 196, 98, 202, 102, 210

Offset: 1

Author

Gary W. Adamson, Feb 17 2007

Keywords

• nonn

Examples

			a(6) = 9 = sum of row 6 terms of A128187: (3 + 3 + 1 + 1 + 1).
		

Crossrefs

Cf. A000005, A128187.

Programs

Maple

A128188 := proc(n)
    add(A128187(n,k),k=1..n) ;
end proc; # R. J. Mathar, Apr 16 2013
with(numtheory): A128188:=n->add(tau(n+2-2*i), i=1..floor((n+2)/2)): seq(A128188(n), n=1..100); # Wesley Ivan Hurt, Jul 12 2015

Formula

a(n) = Sum_{k=1..n} A128187(n,k).

a(n) = Sum_{i=1..floor((n+2)/2)} d(n+2-2i), where d(n) is the number of divisors of n. - Wesley Ivan Hurt, Jul 12 2015