A007280 Multiplicative encoding of partition triangle. (Formerly M1694)

2, 6, 30, 630, 34650, 47297250, 309560501250, 618190773193743750, 66537433850544954015468750, 65572844234095125006030612749369531250, 70740128442809835497514843888197127919441136894531250

Offset

1,1

References

L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 307.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..11.

N. J. A. Sloane, An on-line version of the Encyclopedia of Integer Sequences, Electronic J. Combinatorics, Vol. 1, no. 1, 1994.

Formula

a(n) = Product_{k=1..n} prime(n)^A008284(n,k). - Sean A. Irvine, Dec 03 2017

Crossrefs

Cf. A000040.

Sequence in context: A326867 A320830 A074777 * A280260 A102927 A227105

Adjacent sequences: A007277 A007278 A007279 * A007281 A007282 A007283

Keyword

nonn

Author

N. J. A. Sloane.

Extensions

a(11) from Sean A. Irvine, Dec 03 2017

Status

approved