A257132 a(n) = cpg(n, 3) * cpg(n, 4) * ... * cpg(n, n) where cpg(n, m) is the m-th n-th-order centered polygonal number.

1, 1, 1, 10, 325, 25296, 3902353, 1053700208, 456536705625, 297754617160000, 278395601200346641, 359067467227998071808, 619296691244751962694109, 1392196584708720449376704000, 3992553188360180927537240390625, 14342182990533795228474771602446336

Offset

0,4

Links

Colin Barker, Table of n, a(n) for n = 0..179

Wikipedia, Centered polygonal number

Example

a(4) = cpg(4, 3) * cpg(4, 4) = 13 * 25 = 325.

Prog

(PARI) cpg(m, n) = m*n*(n-1)/2+1
vector(50, n, prod(m=3, n-1, cpg(n-1, m)))

Crossrefs

Cf. A241453, A257133.

Sequence in context: A164055 A064343 A127823 * A218996 A352798 A113082

Adjacent sequences: A257129 A257130 A257131 * A257133 A257134 A257135

Keyword

nonn

Author

Colin Barker, Apr 16 2015

Status

approved