A218768 - cp's OEIS frontend

A218768 a(n+2) = (2n+1)^2a(n+1) + (2n+1)(2n-1)a(n) with a(1)=1 and a(2)=2.

n	a(n)
1	1
2	2
3	21
4	555
5	27930
6	2297295
7	280737765
8	47773195470
9	10803712844925
10	3134455177028175
11	1135027918156081950
12	501797959522466381775
13	265999339071854103540825
14	166538120746634232882536250
15	121585839578169857291258983125
16	102384090433785464586295830691875

[1, 2, 21, 555, 27930, 2297295, 280737765, 47773195470, 10803712844925, 3134455177028175, 1135027918156081950, 501797959522466381775, 265999339071854103540825, 166538120746634232882536250, 121585839578169857291258983125, 102384090433785464586295830691875]

cp's OEIS Frontend

A218768 a(n+2) = (2n+1)^2a(n+1) + (2n+1)(2n-1)a(n) with a(1)=1 and a(2)=2.

Table of values

List of values

cp's OEIS Frontend

A218768 a(n+2) = (2*n+1)^2*a(n+1) + (2*n+1)*(2*n-1)*a(n) with a(1)=1 and a(2)=2.

Table of values

List of values

A218768 a(n+2) = (2n+1)^2a(n+1) + (2n+1)(2n-1)a(n) with a(1)=1 and a(2)=2.