login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A127131 Self-convolution square-root of column 1 (A127128) of triangle A127126. 7
1, 1, 4, 23, 175, 1650, 18451, 237703, 3457763, 55967155, 996755108, 19360232181, 407152004331, 9215091412811, 223307281633261, 5768104533416742, 158197552561322216, 4591028199312877166, 140551293414196198297 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..80

MATHEMATICA

T[n_, k_]:= T[n, k]= If[k==n, 1, Coefficient[(1 +x*Sum[x^(r-k-1)*Sum[T[r, c], {c, k+1, r}], {r, k+1, n}] +x^(n+1))^(k+1), x, n-k]]; CoefficientList[Series[ (Sum[T[n, 1]*x^n, {n, 0, 22}]/x)^(1/2), {x, 0, 20}], x] (* G. C. Greubel, Jan 28 2020 *)

CROSSREFS

Cf. A127126, A127127, A127128, A127129, A127130, A127132, A127133, A127134, A127135.

Sequence in context: A084357 A075729 A328006 * A083355 A141763 A025550

Adjacent sequences:  A127128 A127129 A127130 * A127132 A127133 A127134

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 05 2007

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 5 08:27 EDT 2021. Contains 346464 sequences. (Running on oeis4.)