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A122121 as a simple table

n a(n)
0 0
1 2
2 4
3 11
4 25
5 65
6 168
7 446
8 1229
9 3401
10 9592
11 27293
12 78498
13 227647
14 664579
15 1951957
16 5761455
17 17082666
18 50847534
19 151876932
20 455052511
21 1367199811
22 4118054813
23 12431880460
24 37607912018
25 113983535775
26 346065536839
27 1052370166553
28 3204941750802
29 9773865306521

[0,2,4,11,25,65,168,446,1229,3401,9592,27293,
 78498,227647,664579,1951957,5761455,17082666,
 50847534,151876932,455052511,1367199811,
 4118054813,12431880460,37607912018,113983535775,
 346065536839,1052370166553,3204941750802,
 9773865306521]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)