A138848 Diagonal sums of a Collatz triangle.

1, 2, 5, 10, 10, 13, 16, 25, 40, 42, 51, 49, 65, 58, 83, 94, 108, 143, 141, 208, 184, 294, 241, 333, 319, 486, 424, 689, 559, 959, 744, 1082, 990, 1251, 1319, 1470, 1478, 1765, 2047, 2144, 2330, 2649, 2707, 2900, 2874, 3011, 3096, 3455

Offset: 0

Author

Paul Barry, Mar 31 2008, Apr 02 2008

Keywords

• easy
• nonn

Comments

Diagonal sums of A138895.

Formula

a(n)=sum{k=0..floor(n/2), A092892(n-2k)}