A105856 a(n) = a(n-1) + A104647(n), a(0) = 0.

0, 1, 2, 4, 7, 12, 20, 26, 32, 44, 52, 61, 78, 91, 107, 121, 135, 163, 187, 201, 219, 251, 279, 293, 311, 343, 367, 396, 421, 446, 496, 540, 570, 611, 648, 656, 665, 682, 708, 751, 780, 811, 871, 919, 939, 962, 1005, 1071, 1132, 1161, 1201, 1270, 1327, 1347

Offset: 0

Author

Reinhard Zumkeller, Apr 23 2005

Keywords

• nonn

Comments

a(n)/(n^2) ---> 1/2.