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URL: https://oeis.org/A136791

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A136791
Triangle read by rows: T(n,k) = 2 * A011971(n,k) - 1.
2
1, 1, 3, 3, 5, 9, 9, 13, 19, 29, 29, 39, 53, 73, 103, 103, 133, 173, 227, 301, 405, 405, 509, 643, 817, 1045, 1347, 1753, 1753, 2159, 2669, 3313, 4131, 5177, 6525, 8279, 8279, 10033, 12193, 14863, 18177, 22309, 27487, 34013, 42293, 42293, 50573, 60607, 72801, 87665, 105843, 128153, 155641, 189655, 231949
OFFSET
0,3
EXAMPLE
First few rows of the triangle:
1;
1, 3;
3, 5, 9;
9, 13, 19, 29;
29, 39, 53, 73, 103;
103, 133, 173, 227, 301, 405;
...
MATHEMATICA
Flatten[Table[2 Sum[Binomial[k, i]*BellB[n - k + i], {i, 0, k}] - 1, {n, 0, 9}, {k, 0, n}]] (* Michael De Vlieger, Apr 02 2022, after Jean-François Alcover at A011971 *)
CROSSREFS
Cf. A011971, A136792 (row sums), A060719 (right border).
Sequence in context: A141584 A287195 A179437 * A213933 A091916 A102437
KEYWORD
nonn,tabl
AUTHOR
Gary W. Adamson, Jan 21 2008
EXTENSIONS
a(37) corrected by Zhuorui He, Nov 09 2025
STATUS
approved