login
A027131
a(n) = diagonal sum of left justified array T given by A027113.
0
1, 1, 2, 4, 4, 8, 11, 15, 24, 35, 48, 75, 108, 152, 232, 336, 477, 721, 1046, 1496, 2245, 3264, 4690, 7006, 10200, 14709, 21897, 31916, 46148, 68523, 99962, 144841, 214634, 313327, 454756, 672803, 982718, 1428225, 2110278, 3083747, 4486717, 6622251, 9680743, 14098072, 20789712
OFFSET
0,3
FORMULA
a(n) = Sum_{k=0..n} A027113(n-k, k). - Sean A. Irvine, Oct 23 2019
CROSSREFS
Sequence in context: A034408 A227333 A223317 * A338986 A319803 A055946
KEYWORD
nonn
EXTENSIONS
More terms from Sean A. Irvine, Oct 23 2019
STATUS
approved