A128579 - OEIS

A128579

Antidiagonal sums of table A128570.

1, 2, 7, 44, 419, 5254, 80687, 1458524, 30259147, 707813762, 18421139495, 527856303160, 16513700403347, 560082210938174, 20471657576850655, 802275966701866964, 33560323690860843995, 1492638035099491033402

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OFFSET

0,2

LINKS

Vaclav Kotesovec, Table of n, a(n) for n = 0..200

FORMULA

a(n) ~ exp(1/2) * A128318(n). - Vaclav Kotesovec, Mar 19 2016

PROG

(PARI) {a(n)=local(F=1+x, A=0); for(k=0, n, for(j=0, k, F=1+(n+1-j)*x*F^2 +x*O(x^k)); A+=polcoeff(F, k)); A}

CROSSREFS

Cf. A128570 (triangle), rows: A128318, A128571, A128572, A128573, A128574, A128575, A128576; A128577 (square of row 0), A128578 (main diagonal).

Sequence in context: A194018 A196793 A306880 * A194453 A346258 A242105

Adjacent sequences: A128576 A128577 A128578 * A128580 A128581 A128582

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Mar 11 2007

STATUS

approved