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A207042 as a simple table

n a(n)
1 81
2 270
3 750
4 2244
5 4944
6 11712
7 35904
8 79104
9 187392
10 574464
11 1265664
12 2998272
13 9191424
14 20250624
15 47972352
16 147062784
17 324009984
18 767557632
19 2353004544
20 5184159744
21 12280922112
22 37648072704
23 82946555904
24 196494753792

[81,270,750,2244,4944,11712,35904,79104,187392,
 574464,1265664,2998272,9191424,20250624,47972352,
 147062784,324009984,767557632,2353004544,
 5184159744,12280922112,37648072704,82946555904,
 196494753792]

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Last modified November 29 21:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)