A259797 - OEIS

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A259797 as a simple table

n	a(n)
1	7
2	19
3	62
4	253
5	1104
6	5082
7	24119
8	117016
9	577219
10	2881559
11	14517349
12	73646606
13	375647872
14	1924303223
15	9890611989
16	50972464766
17	263251147564
18	1361885016990
19	7055002534314
20	36586652345539
21	189899006940570

[7,19,62,253,1104,5082,24119,117016,577219, 2881559,14517349,73646606,375647872,1924303223, 9890611989,50972464766,263251147564,1361885016990, 7055002534314,36586652345539,189899006940570]