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A024742
a(n) = A024741(n+3)/6.
0
1, 2, 4, 11, 28, 68, 169, 470, 1276, 3395, 9016, 25736, 71785, 197084, 543136, 1562987, 4441888, 12490268, 35118241, 102094436, 293497252, 836212259, 2384733976, 6972232316, 20220310225, 58240787582, 167689305760, 493029967907, 1438787149228
OFFSET
1,2
CROSSREFS
Cf. A024741.
Sequence in context: A099412 A100094 A099525 * A024962 A202085 A122423
KEYWORD
nonn
EXTENSIONS
a(28) corrected by Sean A. Irvine, Jul 21 2019
STATUS
approved