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A023669
Convolution of A001950 and A014306.
0
0, 2, 7, 12, 19, 30, 42, 57, 75, 93, 114, 137, 162, 191, 222, 255, 292, 330, 372, 414, 457, 504, 553, 605, 660, 716, 777, 839, 903, 972, 1041, 1114, 1190, 1267, 1347, 1427, 1510, 1597, 1684, 1777, 1870, 1966, 2065, 2166, 2271, 2378, 2486, 2600
OFFSET
1,2
CROSSREFS
Sequence in context: A299401 A188039 A133459 * A137401 A309150 A333354
KEYWORD
nonn
STATUS
approved