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A033434 as a simple table

n a(n)
0 1
1 4
2 13
3 43
4 145
5 497
6 1727
7 6071
8 21554
9 77180
10 278426
11 1010990
12 3692213
13 13553555
14 49981875
15 185082495
16 687923790
17 2565602160
18 9598056630
19 36008860650
20 135446603370
21 510706730274
22 1929930236790
23 7308166696118
24 27727426756580
25 105387411817352
26 401231661076148
27 1529970156473276
28 5842655231153741
29 22342874048993015

[1,4,13,43,145,497,1727,6071,21554,77180,278426,
 1010990,3692213,13553555,49981875,185082495,
 687923790,2565602160,9598056630,36008860650,
 135446603370,510706730274,1929930236790,
 7308166696118,27727426756580,105387411817352,
 401231661076148,1529970156473276,5842655231153741,
 22342874048993015]

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Last modified April 25 11:34 EDT 2024. Contains 371967 sequences. (Running on oeis4.)