Hexagonal pyramidal number

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A hexagonal pyramidal number is a number formed by adding the first few hexagonal numbers. The first few numbers are:

1, 7, 22, 50, 95, 161, 252, 372, 525, 715, 946, 1222, 1547, 1925 (sequence A002412 in the OEIS)

The numbers have the form:

${n(n+1)(4n-1)} \over 6$

References

Hexagonal pyramidal number at MathWorld

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