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A027139
T(n,n+1) + T(n,n+2) + ... + T(n,2n), T given by A027113.
0
2, 7, 23, 72, 218, 648, 1907, 5581, 16290, 47502, 138521, 404183, 1180402, 3450899, 10099605, 29589780, 86781374, 254761882, 748580729, 2201465799, 6479301022, 19083705249, 56246157177, 165881453558, 489506759446
OFFSET
0,1
CROSSREFS
Sequence in context: A076656 A085387 A147970 * A295136 A192906 A217664
KEYWORD
nonn
STATUS
approved