

A252869


Number of n X n nonnegative integer arrays with upper left 0 and lower right 2n4 and value increasing by 0 or 1 with every step right or down.


2



0, 1, 44, 615, 7313, 85801, 1030330, 12742873, 161937617, 2105918045, 27918122131, 376111502977, 5136280530303, 70961632168027, 990271171218092, 13940676224604419, 197768060575469207, 2824828302263709187, 40595088350375470407, 586585037283553891311
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