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A152404
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Column 1 of matrix square of triangle A152400; also, column 3 of square array A152405
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5
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1, 4, 22, 152, 1251, 11869, 126987, 1508209, 19651299, 278321523, 4253151796, 69700149063, 1218679465845, 22634882689433, 444893598200458, 9223269744306877, 201091581942120957, 4598872183673896769
(list; graph; refs; listen; history; internal format)
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